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+/* http://keith-wood.name/countdown.html
+   Countdown for jQuery v1.5.8.
+   Written by Keith Wood (kbwood{at}iinet.com.au) January 2008.
+   Dual licensed under the GPL (http://dev.jquery.com/browser/trunk/jquery/GPL-LICENSE.txt) and 
+   MIT (http://dev.jquery.com/browser/trunk/jquery/MIT-LICENSE.txt) licenses. 
+   Please attribute the author if you use it. */
+
+/* Display a countdown timer.
+   Attach it with options like:
+   $('div selector').countdown(
+       {until: new Date(2009, 1 - 1, 1, 0, 0, 0), onExpiry: happyNewYear}); */
+
+(function($) { // Hide scope, no $ conflict
+
+/* Countdown manager. */
+function Countdown() {
+	this.regional = []; // Available regional settings, indexed by language code
+	this.regional[''] = { // Default regional settings
+		// The display texts for the counters
+		labels: ['Years', 'Months', 'Weeks', 'Days', 'Hours', 'Minutes', 'Seconds'],
+		// The display texts for the counters if only one
+		labels1: ['Year', 'Month', 'Week', 'Day', 'Hour', 'Minute', 'Second'],
+		compactLabels: ['y', 'm', 'w', 'd'], // The compact texts for the counters
+		whichLabels: null, // Function to determine which labels to use
+		timeSeparator: ':', // Separator for time periods
+		isRTL: false // True for right-to-left languages, false for left-to-right
+	};
+	this._defaults = {
+		until: null, // new Date(year, mth - 1, day, hr, min, sec) - date/time to count down to
+			// or numeric for seconds offset, or string for unit offset(s):
+			// 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds
+		since: null, // new Date(year, mth - 1, day, hr, min, sec) - date/time to count up from
+			// or numeric for seconds offset, or string for unit offset(s):
+			// 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds
+		timezone: null, // The timezone (hours or minutes from GMT) for the target times,
+			// or null for client local
+		serverSync: null, // A function to retrieve the current server time for synchronisation
+		format: 'dHMS', // Format for display - upper case for always, lower case only if non-zero,
+			// 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds
+		layout: '', // Build your own layout for the countdown
+		compact: false, // True to display in a compact format, false for an expanded one
+		significant: 0, // The number of periods with values to show, zero for all
+		description: '', // The description displayed for the countdown
+		expiryUrl: '', // A URL to load upon expiry, replacing the current page
+		expiryText: '', // Text to display upon expiry, replacing the countdown
+		alwaysExpire: false, // True to trigger onExpiry even if never counted down
+		onExpiry: null, // Callback when the countdown expires -
+			// receives no parameters and 'this' is the containing division
+		onTick: null, // Callback when the countdown is updated -
+			// receives int[7] being the breakdown by period (based on format)
+			// and 'this' is the containing division
+		tickInterval: 1 // Interval (seconds) between onTick callbacks
+	};
+	$.extend(this._defaults, this.regional['']);
+	this._serverSyncs = [];
+}
+
+var PROP_NAME = 'countdown';
+
+var Y = 0; // Years
+var O = 1; // Months
+var W = 2; // Weeks
+var D = 3; // Days
+var H = 4; // Hours
+var M = 5; // Minutes
+var S = 6; // Seconds
+
+$.extend(Countdown.prototype, {
+	/* Class name added to elements to indicate already configured with countdown. */
+	markerClassName: 'hasCountdown',
+	
+	/* Shared timer for all countdowns. */
+	_timer: setInterval(function() { $.countdown._updateTargets(); }, 980),
+	/* List of currently active countdown targets. */
+	_timerTargets: [],
+	
+	/* Override the default settings for all instances of the countdown widget.
+	   @param  options  (object) the new settings to use as defaults */
+	setDefaults: function(options) {
+		this._resetExtraLabels(this._defaults, options);
+		extendRemove(this._defaults, options || {});
+	},
+
+	/* Convert a date/time to UTC.
+	   @param  tz     (number) the hour or minute offset from GMT, e.g. +9, -360
+	   @param  year   (Date) the date/time in that timezone or
+	                  (number) the year in that timezone
+	   @param  month  (number, optional) the month (0 - 11) (omit if year is a Date)
+	   @param  day    (number, optional) the day (omit if year is a Date)
+	   @param  hours  (number, optional) the hour (omit if year is a Date)
+	   @param  mins   (number, optional) the minute (omit if year is a Date)
+	   @param  secs   (number, optional) the second (omit if year is a Date)
+	   @param  ms     (number, optional) the millisecond (omit if year is a Date)
+	   @return  (Date) the equivalent UTC date/time */
+	UTCDate: function(tz, year, month, day, hours, mins, secs, ms) {
+		if (typeof year == 'object' && year.constructor == Date) {
+			ms = year.getMilliseconds();
+			secs = year.getSeconds();
+			mins = year.getMinutes();
+			hours = year.getHours();
+			day = year.getDate();
+			month = year.getMonth();
+			year = year.getFullYear();
+		}
+		var d = new Date();
+		d.setUTCFullYear(year);
+		d.setUTCDate(1);
+		d.setUTCMonth(month || 0);
+		d.setUTCDate(day || 1);
+		d.setUTCHours(hours || 0);
+		d.setUTCMinutes((mins || 0) - (Math.abs(tz) < 30 ? tz * 60 : tz));
+		d.setUTCSeconds(secs || 0);
+		d.setUTCMilliseconds(ms || 0);
+		return d;
+	},
+
+	/* Convert a set of periods into seconds.
+	   Averaged for months and years.
+	   @param  periods  (number[7]) the periods per year/month/week/day/hour/minute/second
+	   @return  (number) the corresponding number of seconds */
+	periodsToSeconds: function(periods) {
+		return periods[0] * 31557600 + periods[1] * 2629800 + periods[2] * 604800 +
+			periods[3] * 86400 + periods[4] * 3600 + periods[5] * 60 + periods[6];
+	},
+
+	/* Retrieve one or more settings values.
+	   @param  name  (string, optional) the name of the setting to retrieve
+	                 or 'all' for all instance settings or omit for all default settings
+	   @return  (any) the requested setting(s) */
+	_settingsCountdown: function(target, name) {
+		if (!name) {
+			return $.countdown._defaults;
+		}
+		var inst = $.data(target, PROP_NAME);
+		return (name == 'all' ? inst.options : inst.options[name]);
+	},
+
+	/* Attach the countdown widget to a div.
+	   @param  target   (element) the containing division
+	   @param  options  (object) the initial settings for the countdown */
+	_attachCountdown: function(target, options) {
+		var $target = $(target);
+		if ($target.hasClass(this.markerClassName)) {
+			return;
+		}
+		$target.addClass(this.markerClassName);
+		var inst = {options: $.extend({}, options),
+			_periods: [0, 0, 0, 0, 0, 0, 0]};
+		$.data(target, PROP_NAME, inst);
+		this._changeCountdown(target);
+	},
+
+	/* Add a target to the list of active ones.
+	   @param  target  (element) the countdown target */
+	_addTarget: function(target) {
+		if (!this._hasTarget(target)) {
+			this._timerTargets.push(target);
+		}
+	},
+
+	/* See if a target is in the list of active ones.
+	   @param  target  (element) the countdown target
+	   @return  (boolean) true if present, false if not */
+	_hasTarget: function(target) {
+		return ($.inArray(target, this._timerTargets) > -1);
+	},
+
+	/* Remove a target from the list of active ones.
+	   @param  target  (element) the countdown target */
+	_removeTarget: function(target) {
+		this._timerTargets = $.map(this._timerTargets,
+			function(value) { return (value == target ? null : value); }); // delete entry
+	},
+
+	/* Update each active timer target. */
+	_updateTargets: function() {
+		for (var i = this._timerTargets.length - 1; i >= 0; i--) {
+			this._updateCountdown(this._timerTargets[i]);
+		}
+	},
+
+	/* Redisplay the countdown with an updated display.
+	   @param  target  (jQuery) the containing division
+	   @param  inst    (object) the current settings for this instance */
+	_updateCountdown: function(target, inst) {
+		var $target = $(target);
+		inst = inst || $.data(target, PROP_NAME);
+		if (!inst) {
+			return;
+		}
+		$target.html(this._generateHTML(inst));
+		$target[(this._get(inst, 'isRTL') ? 'add' : 'remove') + 'Class']('countdown_rtl');
+		var onTick = this._get(inst, 'onTick');
+		if (onTick) {
+			var periods = inst._hold != 'lap' ? inst._periods :
+				this._calculatePeriods(inst, inst._show, this._get(inst, 'significant'), new Date());
+			var tickInterval = this._get(inst, 'tickInterval');
+			if (tickInterval == 1 || this.periodsToSeconds(periods) % tickInterval == 0) {
+				onTick.apply(target, [periods]);
+			}
+		}
+		var expired = inst._hold != 'pause' &&
+			(inst._since ? inst._now.getTime() < inst._since.getTime() :
+			inst._now.getTime() >= inst._until.getTime());
+		if (expired && !inst._expiring) {
+			inst._expiring = true;
+			if (this._hasTarget(target) || this._get(inst, 'alwaysExpire')) {
+				this._removeTarget(target);
+				var onExpiry = this._get(inst, 'onExpiry');
+				if (onExpiry) {
+					onExpiry.apply(target, []);
+				}
+				var expiryText = this._get(inst, 'expiryText');
+				if (expiryText) {
+					var layout = this._get(inst, 'layout');
+					inst.options.layout = expiryText;
+					this._updateCountdown(target, inst);
+					inst.options.layout = layout;
+				}
+				var expiryUrl = this._get(inst, 'expiryUrl');
+				if (expiryUrl) {
+					window.location = expiryUrl;
+				}
+			}
+			inst._expiring = false;
+		}
+		else if (inst._hold == 'pause') {
+			this._removeTarget(target);
+		}
+		$.data(target, PROP_NAME, inst);
+	},
+
+	/* Reconfigure the settings for a countdown div.
+	   @param  target   (element) the containing division
+	   @param  options  (object) the new settings for the countdown or
+	                    (string) an individual property name
+	   @param  value    (any) the individual property value
+	                    (omit if options is an object) */
+	_changeCountdown: function(target, options, value) {
+		options = options || {};
+		if (typeof options == 'string') {
+			var name = options;
+			options = {};
+			options[name] = value;
+		}
+		var inst = $.data(target, PROP_NAME);
+		if (inst) {
+			this._resetExtraLabels(inst.options, options);
+			extendRemove(inst.options, options);
+			this._adjustSettings(target, inst);
+			$.data(target, PROP_NAME, inst);
+			var now = new Date();
+			if ((inst._since && inst._since < now) ||
+					(inst._until && inst._until > now)) {
+				this._addTarget(target);
+			}
+			this._updateCountdown(target, inst);
+		}
+	},
+
+	/* Reset any extra labelsn and compactLabelsn entries if changing labels.
+	   @param  base     (object) the options to be updated
+	   @param  options  (object) the new option values */
+	_resetExtraLabels: function(base, options) {
+		var changingLabels = false;
+		for (var n in options) {
+			if (n != 'whichLabels' && n.match(/[Ll]abels/)) {
+				changingLabels = true;
+				break;
+			}
+		}
+		if (changingLabels) {
+			for (var n in base) { // Remove custom numbered labels
+				if (n.match(/[Ll]abels[0-9]/)) {
+					base[n] = null;
+				}
+			}
+		}
+	},
+	
+	/* Calculate interal settings for an instance.
+	   @param  target  (element) the containing division
+	   @param  inst    (object) the current settings for this instance */
+	_adjustSettings: function(target, inst) {
+		var now;
+		var serverSync = this._get(inst, 'serverSync');
+		var serverOffset = 0;
+		var serverEntry = null;
+		for (var i = 0; i < this._serverSyncs.length; i++) {
+			if (this._serverSyncs[i][0] == serverSync) {
+				serverEntry = this._serverSyncs[i][1];
+				break;
+			}
+		}
+		if (serverEntry != null) {
+			serverOffset = (serverSync ? serverEntry : 0);
+			now = new Date();
+		}
+		else {
+			var serverResult = (serverSync ? serverSync.apply(target, []) : null);
+			now = new Date();
+			serverOffset = (serverResult ? now.getTime() - serverResult.getTime() : 0);
+			this._serverSyncs.push([serverSync, serverOffset]);
+		}
+		var timezone = this._get(inst, 'timezone');
+		timezone = (timezone == null ? -now.getTimezoneOffset() : timezone);
+		inst._since = this._get(inst, 'since');
+		if (inst._since != null) {
+			inst._since = this.UTCDate(timezone, this._determineTime(inst._since, null));
+			if (inst._since && serverOffset) {
+				inst._since.setMilliseconds(inst._since.getMilliseconds() + serverOffset);
+			}
+		}
+		inst._until = this.UTCDate(timezone, this._determineTime(this._get(inst, 'until'), now));
+		if (serverOffset) {
+			inst._until.setMilliseconds(inst._until.getMilliseconds() + serverOffset);
+		}
+		inst._show = this._determineShow(inst);
+	},
+
+	/* Remove the countdown widget from a div.
+	   @param  target  (element) the containing division */
+	_destroyCountdown: function(target) {
+		var $target = $(target);
+		if (!$target.hasClass(this.markerClassName)) {
+			return;
+		}
+		this._removeTarget(target);
+		$target.removeClass(this.markerClassName).empty();
+		$.removeData(target, PROP_NAME);
+	},
+
+	/* Pause a countdown widget at the current time.
+	   Stop it running but remember and display the current time.
+	   @param  target  (element) the containing division */
+	_pauseCountdown: function(target) {
+		this._hold(target, 'pause');
+	},
+
+	/* Pause a countdown widget at the current time.
+	   Stop the display but keep the countdown running.
+	   @param  target  (element) the containing division */
+	_lapCountdown: function(target) {
+		this._hold(target, 'lap');
+	},
+
+	/* Resume a paused countdown widget.
+	   @param  target  (element) the containing division */
+	_resumeCountdown: function(target) {
+		this._hold(target, null);
+	},
+
+	/* Pause or resume a countdown widget.
+	   @param  target  (element) the containing division
+	   @param  hold    (string) the new hold setting */
+	_hold: function(target, hold) {
+		var inst = $.data(target, PROP_NAME);
+		if (inst) {
+			if (inst._hold == 'pause' && !hold) {
+				inst._periods = inst._savePeriods;
+				var sign = (inst._since ? '-' : '+');
+				inst[inst._since ? '_since' : '_until'] =
+					this._determineTime(sign + inst._periods[0] + 'y' +
+						sign + inst._periods[1] + 'o' + sign + inst._periods[2] + 'w' +
+						sign + inst._periods[3] + 'd' + sign + inst._periods[4] + 'h' + 
+						sign + inst._periods[5] + 'm' + sign + inst._periods[6] + 's');
+				this._addTarget(target);
+			}
+			inst._hold = hold;
+			inst._savePeriods = (hold == 'pause' ? inst._periods : null);
+			$.data(target, PROP_NAME, inst);
+			this._updateCountdown(target, inst);
+		}
+	},
+
+	/* Return the current time periods.
+	   @param  target  (element) the containing division
+	   @return  (number[7]) the current periods for the countdown */
+	_getTimesCountdown: function(target) {
+		var inst = $.data(target, PROP_NAME);
+		return (!inst ? null : (!inst._hold ? inst._periods :
+			this._calculatePeriods(inst, inst._show, this._get(inst, 'significant'), new Date())));
+	},
+
+	/* Get a setting value, defaulting if necessary.
+	   @param  inst  (object) the current settings for this instance
+	   @param  name  (string) the name of the required setting
+	   @return  (any) the setting's value or a default if not overridden */
+	_get: function(inst, name) {
+		return (inst.options[name] != null ?
+			inst.options[name] : $.countdown._defaults[name]);
+	},
+
+	/* A time may be specified as an exact value or a relative one.
+	   @param  setting      (string or number or Date) - the date/time value
+	                        as a relative or absolute value
+	   @param  defaultTime  (Date) the date/time to use if no other is supplied
+	   @return  (Date) the corresponding date/time */
+	_determineTime: function(setting, defaultTime) {
+		var offsetNumeric = function(offset) { // e.g. +300, -2
+			var time = new Date();
+			time.setTime(time.getTime() + offset * 1000);
+			return time;
+		};
+		var offsetString = function(offset) { // e.g. '+2d', '-4w', '+3h +30m'
+			offset = offset.toLowerCase();
+			var time = new Date();
+			var year = time.getFullYear();
+			var month = time.getMonth();
+			var day = time.getDate();
+			var hour = time.getHours();
+			var minute = time.getMinutes();
+			var second = time.getSeconds();
+			var pattern = /([+-]?[0-9]+)\s*(s|m|h|d|w|o|y)?/g;
+			var matches = pattern.exec(offset);
+			while (matches) {
+				switch (matches[2] || 's') {
+					case 's': second += parseInt(matches[1], 10); break;
+					case 'm': minute += parseInt(matches[1], 10); break;
+					case 'h': hour += parseInt(matches[1], 10); break;
+					case 'd': day += parseInt(matches[1], 10); break;
+					case 'w': day += parseInt(matches[1], 10) * 7; break;
+					case 'o':
+						month += parseInt(matches[1], 10); 
+						day = Math.min(day, $.countdown._getDaysInMonth(year, month));
+						break;
+					case 'y':
+						year += parseInt(matches[1], 10);
+						day = Math.min(day, $.countdown._getDaysInMonth(year, month));
+						break;
+				}
+				matches = pattern.exec(offset);
+			}
+			return new Date(year, month, day, hour, minute, second, 0);
+		};
+		var time = (setting == null ? defaultTime :
+			(typeof setting == 'string' ? offsetString(setting) :
+			(typeof setting == 'number' ? offsetNumeric(setting) : setting)));
+		if (time) time.setMilliseconds(0);
+		return time;
+	},
+
+	/* Determine the number of days in a month.
+	   @param  year   (number) the year
+	   @param  month  (number) the month
+	   @return  (number) the days in that month */
+	_getDaysInMonth: function(year, month) {
+		return 32 - new Date(year, month, 32).getDate();
+	},
+
+	/* Determine which set of labels should be used for an amount.
+	   @param  num  (number) the amount to be displayed
+	   @return  (number) the set of labels to be used for this amount */
+	_normalLabels: function(num) {
+		return num;
+	},
+
+	/* Generate the HTML to display the countdown widget.
+	   @param  inst  (object) the current settings for this instance
+	   @return  (string) the new HTML for the countdown display */
+	_generateHTML: function(inst) {
+		// Determine what to show
+		var significant = this._get(inst, 'significant');
+		inst._periods = (inst._hold ? inst._periods :
+			this._calculatePeriods(inst, inst._show, significant, new Date()));
+		// Show all 'asNeeded' after first non-zero value
+		var shownNonZero = false;
+		var showCount = 0;
+		var sigCount = significant;
+		var show = $.extend({}, inst._show);
+		for (var period = Y; period <= S; period++) {
+			shownNonZero |= (inst._show[period] == '?' && inst._periods[period] > 0);
+			show[period] = (inst._show[period] == '?' && !shownNonZero ? null : inst._show[period]);
+			showCount += (show[period] ? 1 : 0);
+			sigCount -= (inst._periods[period] > 0 ? 1 : 0);
+		}
+		var showSignificant = [false, false, false, false, false, false, false];
+		for (var period = S; period >= Y; period--) { // Determine significant periods
+			if (inst._show[period]) {
+				if (inst._periods[period]) {
+					showSignificant[period] = true;
+				}
+				else {
+					showSignificant[period] = sigCount > 0;
+					sigCount--;
+				}
+			}
+		}
+		var compact = this._get(inst, 'compact');
+		var layout = this._get(inst, 'layout');
+		var labels = (compact ? this._get(inst, 'compactLabels') : this._get(inst, 'labels'));
+		var whichLabels = this._get(inst, 'whichLabels') || this._normalLabels;
+		var timeSeparator = this._get(inst, 'timeSeparator');
+		var description = this._get(inst, 'description') || '';
+		var showCompact = function(period) {
+			var labelsNum = $.countdown._get(inst,
+				'compactLabels' + whichLabels(inst._periods[period]));
+			return (show[period] ? inst._periods[period] +
+				(labelsNum ? labelsNum[period] : labels[period]) + ' ' : '');
+		};
+		var showFull = function(period) {
+			var labelsNum = $.countdown._get(inst, 'labels' + whichLabels(inst._periods[period]));
+			return ((!significant && show[period]) || (significant && showSignificant[period]) ?
+				'<span class="countdown_section"><span class="countdown_amount">' +
+				inst._periods[period] + '</span><br/>' +
+				(labelsNum ? labelsNum[period] : labels[period]) + '</span>' : '');
+		};
+		return (layout ? this._buildLayout(inst, show, layout, compact, significant, showSignificant) :
+			((compact ? // Compact version
+			'<span class="countdown_row countdown_amount' +
+			(inst._hold ? ' countdown_holding' : '') + '">' + 
+			showCompact(Y) + showCompact(O) + showCompact(W) + showCompact(D) + 
+			(show[H] ? this._minDigits(inst._periods[H], 2) : '') +
+			(show[M] ? (show[H] ? timeSeparator : '') +
+			this._minDigits(inst._periods[M], 2) : '') +
+			(show[S] ? (show[H] || show[M] ? timeSeparator : '') +
+			this._minDigits(inst._periods[S], 2) : '') :
+			// Full version
+			'<span class="countdown_row countdown_show' + (significant || showCount) +
+			(inst._hold ? ' countdown_holding' : '') + '">' +
+			showFull(Y) + showFull(O) + showFull(W) + showFull(D) +
+			showFull(H) + showFull(M) + showFull(S)) + '</span>' +
+			(description ? '<span class="countdown_row countdown_descr">' + description + '</span>' : '')));
+	},
+
+	/* Construct a custom layout.
+	   @param  inst             (object) the current settings for this instance
+	   @param  show             (string[7]) flags indicating which periods are requested
+	   @param  layout           (string) the customised layout
+	   @param  compact          (boolean) true if using compact labels
+	   @param  significant      (number) the number of periods with values to show, zero for all
+	   @param  showSignificant  (boolean[7]) other periods to show for significance
+	   @return  (string) the custom HTML */
+	_buildLayout: function(inst, show, layout, compact, significant, showSignificant) {
+		var labels = this._get(inst, (compact ? 'compactLabels' : 'labels'));
+		var whichLabels = this._get(inst, 'whichLabels') || this._normalLabels;
+		var labelFor = function(index) {
+			return ($.countdown._get(inst,
+				(compact ? 'compactLabels' : 'labels') + whichLabels(inst._periods[index])) ||
+				labels)[index];
+		};
+		var digit = function(value, position) {
+			return Math.floor(value / position) % 10;
+		};
+		var subs = {desc: this._get(inst, 'description'), sep: this._get(inst, 'timeSeparator'),
+			yl: labelFor(Y), yn: inst._periods[Y], ynn: this._minDigits(inst._periods[Y], 2),
+			ynnn: this._minDigits(inst._periods[Y], 3), y1: digit(inst._periods[Y], 1),
+			y10: digit(inst._periods[Y], 10), y100: digit(inst._periods[Y], 100),
+			y1000: digit(inst._periods[Y], 1000),
+			ol: labelFor(O), on: inst._periods[O], onn: this._minDigits(inst._periods[O], 2),
+			onnn: this._minDigits(inst._periods[O], 3), o1: digit(inst._periods[O], 1),
+			o10: digit(inst._periods[O], 10), o100: digit(inst._periods[O], 100),
+			o1000: digit(inst._periods[O], 1000),
+			wl: labelFor(W), wn: inst._periods[W], wnn: this._minDigits(inst._periods[W], 2),
+			wnnn: this._minDigits(inst._periods[W], 3), w1: digit(inst._periods[W], 1),
+			w10: digit(inst._periods[W], 10), w100: digit(inst._periods[W], 100),
+			w1000: digit(inst._periods[W], 1000),
+			dl: labelFor(D), dn: inst._periods[D], dnn: this._minDigits(inst._periods[D], 2),
+			dnnn: this._minDigits(inst._periods[D], 3), d1: digit(inst._periods[D], 1),
+			d10: digit(inst._periods[D], 10), d100: digit(inst._periods[D], 100),
+			d1000: digit(inst._periods[D], 1000),
+			hl: labelFor(H), hn: inst._periods[H], hnn: this._minDigits(inst._periods[H], 2),
+			hnnn: this._minDigits(inst._periods[H], 3), h1: digit(inst._periods[H], 1),
+			h10: digit(inst._periods[H], 10), h100: digit(inst._periods[H], 100),
+			h1000: digit(inst._periods[H], 1000),
+			ml: labelFor(M), mn: inst._periods[M], mnn: this._minDigits(inst._periods[M], 2),
+			mnnn: this._minDigits(inst._periods[M], 3), m1: digit(inst._periods[M], 1),
+			m10: digit(inst._periods[M], 10), m100: digit(inst._periods[M], 100),
+			m1000: digit(inst._periods[M], 1000),
+			sl: labelFor(S), sn: inst._periods[S], snn: this._minDigits(inst._periods[S], 2),
+			snnn: this._minDigits(inst._periods[S], 3), s1: digit(inst._periods[S], 1),
+			s10: digit(inst._periods[S], 10), s100: digit(inst._periods[S], 100),
+			s1000: digit(inst._periods[S], 1000)};
+		var html = layout;
+		// Replace period containers: {p<}...{p>}
+		for (var i = Y; i <= S; i++) {
+			var period = 'yowdhms'.charAt(i);
+			var re = new RegExp('\\{' + period + '<\\}(.*)\\{' + period + '>\\}', 'g');
+			html = html.replace(re, ((!significant && show[i]) ||
+				(significant && showSignificant[i]) ? '$1' : ''));
+		}
+		// Replace period values: {pn}
+		$.each(subs, function(n, v) {
+			var re = new RegExp('\\{' + n + '\\}', 'g');
+			html = html.replace(re, v);
+		});
+		return html;
+	},
+
+	/* Ensure a numeric value has at least n digits for display.
+	   @param  value  (number) the value to display
+	   @param  len    (number) the minimum length
+	   @return  (string) the display text */
+	_minDigits: function(value, len) {
+		value = '' + value;
+		if (value.length >= len) {
+			return value;
+		}
+		value = '0000000000' + value;
+		return value.substr(value.length - len);
+	},
+
+	/* Translate the format into flags for each period.
+	   @param  inst  (object) the current settings for this instance
+	   @return  (string[7]) flags indicating which periods are requested (?) or
+	            required (!) by year, month, week, day, hour, minute, second */
+	_determineShow: function(inst) {
+		var format = this._get(inst, 'format');
+		var show = [];
+		show[Y] = (format.match('y') ? '?' : (format.match('Y') ? '!' : null));
+		show[O] = (format.match('o') ? '?' : (format.match('O') ? '!' : null));
+		show[W] = (format.match('w') ? '?' : (format.match('W') ? '!' : null));
+		show[D] = (format.match('d') ? '?' : (format.match('D') ? '!' : null));
+		show[H] = (format.match('h') ? '?' : (format.match('H') ? '!' : null));
+		show[M] = (format.match('m') ? '?' : (format.match('M') ? '!' : null));
+		show[S] = (format.match('s') ? '?' : (format.match('S') ? '!' : null));
+		return show;
+	},
+	
+	/* Calculate the requested periods between now and the target time.
+	   @param  inst         (object) the current settings for this instance
+	   @param  show         (string[7]) flags indicating which periods are requested/required
+	   @param  significant  (number) the number of periods with values to show, zero for all
+	   @param  now          (Date) the current date and time
+	   @return  (number[7]) the current time periods (always positive)
+	            by year, month, week, day, hour, minute, second */
+	_calculatePeriods: function(inst, show, significant, now) {
+		// Find endpoints
+		inst._now = now;
+		inst._now.setMilliseconds(0);
+		var until = new Date(inst._now.getTime());
+		if (inst._since) {
+			if (now.getTime() < inst._since.getTime()) {
+				inst._now = now = until;
+			}
+			else {
+				now = inst._since;
+			}
+		}
+		else {
+			until.setTime(inst._until.getTime());
+			if (now.getTime() > inst._until.getTime()) {
+				inst._now = now = until;
+			}
+		}
+		// Calculate differences by period
+		var periods = [0, 0, 0, 0, 0, 0, 0];
+		if (show[Y] || show[O]) {
+			// Treat end of months as the same
+			var lastNow = $.countdown._getDaysInMonth(now.getFullYear(), now.getMonth());
+			var lastUntil = $.countdown._getDaysInMonth(until.getFullYear(), until.getMonth());
+			var sameDay = (until.getDate() == now.getDate() ||
+				(until.getDate() >= Math.min(lastNow, lastUntil) &&
+				now.getDate() >= Math.min(lastNow, lastUntil)));
+			var getSecs = function(date) {
+				return (date.getHours() * 60 + date.getMinutes()) * 60 + date.getSeconds();
+			};
+			var months = Math.max(0,
+				(until.getFullYear() - now.getFullYear()) * 12 + until.getMonth() - now.getMonth() +
+				((until.getDate() < now.getDate() && !sameDay) ||
+				(sameDay && getSecs(until) < getSecs(now)) ? -1 : 0));
+			periods[Y] = (show[Y] ? Math.floor(months / 12) : 0);
+			periods[O] = (show[O] ? months - periods[Y] * 12 : 0);
+			// Adjust for months difference and end of month if necessary
+			now = new Date(now.getTime());
+			var wasLastDay = (now.getDate() == lastNow);
+			var lastDay = $.countdown._getDaysInMonth(now.getFullYear() + periods[Y],
+				now.getMonth() + periods[O]);
+			if (now.getDate() > lastDay) {
+				now.setDate(lastDay);
+			}
+			now.setFullYear(now.getFullYear() + periods[Y]);
+			now.setMonth(now.getMonth() + periods[O]);
+			if (wasLastDay) {
+				now.setDate(lastDay);
+			}
+		}
+		var diff = Math.floor((until.getTime() - now.getTime()) / 1000);
+		var extractPeriod = function(period, numSecs) {
+			periods[period] = (show[period] ? Math.floor(diff / numSecs) : 0);
+			diff -= periods[period] * numSecs;
+		};
+		extractPeriod(W, 604800);
+		extractPeriod(D, 86400);
+		extractPeriod(H, 3600);
+		extractPeriod(M, 60);
+		extractPeriod(S, 1);
+		if (diff > 0 && !inst._since) { // Round up if left overs
+			var multiplier = [1, 12, 4.3482, 7, 24, 60, 60];
+			var lastShown = S;
+			var max = 1;
+			for (var period = S; period >= Y; period--) {
+				if (show[period]) {
+					if (periods[lastShown] >= max) {
+						periods[lastShown] = 0;
+						diff = 1;
+					}
+					if (diff > 0) {
+						periods[period]++;
+						diff = 0;
+						lastShown = period;
+						max = 1;
+					}
+				}
+				max *= multiplier[period];
+			}
+		}
+		if (significant) { // Zero out insignificant periods
+			for (var period = Y; period <= S; period++) {
+				if (significant && periods[period]) {
+					significant--;
+				}
+				else if (!significant) {
+					periods[period] = 0;
+				}
+			}
+		}
+		return periods;
+	}
+});
+
+/* jQuery extend now ignores nulls!
+   @param  target  (object) the object to update
+   @param  props   (object) the new settings
+   @return  (object) the updated object */
+function extendRemove(target, props) {
+	$.extend(target, props);
+	for (var name in props) {
+		if (props[name] == null) {
+			target[name] = null;
+		}
+	}
+	return target;
+}
+
+/* Process the countdown functionality for a jQuery selection.
+   @param  command  (string) the command to run (optional, default 'attach')
+   @param  options  (object) the new settings to use for these countdown instances
+   @return  (jQuery) for chaining further calls */
+$.fn.countdown = function(options) {
+	var otherArgs = Array.prototype.slice.call(arguments, 1);
+	if (options == 'getTimes' || options == 'settings') {
+		return $.countdown['_' + options + 'Countdown'].
+			apply($.countdown, [this[0]].concat(otherArgs));
+	}
+	return this.each(function() {
+		if (typeof options == 'string') {
+			$.countdown['_' + options + 'Countdown'].apply($.countdown, [this].concat(otherArgs));
+		}
+		else {
+			$.countdown._attachCountdown(this, options);
+		}
+	});
+};
+
+/* Initialise the countdown functionality. */
+$.countdown = new Countdown(); // singleton instance
+
+})(jQuery);