/*
Script: DHTML Easy Countdown (Development Version - not intended for production use due to uncompressed size)
Description: Counts down or up from a date (this is the non-XHTML version)
Author: Andrew Urquhart
Home: http://andrewu.co.uk/clj/countdown/
History:
20040117 0035UTC	v1		Andrew Urquhart		Created
20040119 1943UTC	v1.1	"					Made more accessible/easier to use
20040317 1548UTC	v1.2	"					Implemented a less intrusive error message
20040331 1408BST	v1.3	"					Attempts to append to the current onload schedule, rather than overriding it
20050210 1558GMT	v1.4	"					Saves a short-cut to each countdown Id element and re-uses that rather than continually 
                                       calling getElementById - faster. Also reduced all nouns to short-versions to decrease size of script
20050216 0018GMT	v1.41	"					Added support for IE4
20051231 0210GMT	v1.5	"					Switched to custom date format and custom date parser for better internationalisation and cross-browser 
                                       compatibility (should fix reports of recent bugs in Mac browsers)
20060101 1649GMT	v1.52	"					Made counter update 0.1s after the last whole second to ensure that the browser doesn't render the display 
                                       at the exact moment the counter changes - otherwise can appear to miss a second out
20070414 2313BST	v1.53	"					Added 'typeof CD_T' check to CD_T() and test for CD_OBJS[id] in CD_D incase references don't exist when the timeout resolves
*/

// Tick (countdownId, eventDate)
function CD_T(id, e) {
	var n = new Date();
	CD_D(+n, id, e);
	setTimeout("if(typeof CD_T=='function'){CD_T('" + id + "'," + e + ")}", 1100-n.getMilliseconds()); 
   // We offset from 1100 so that our clock ticks every second (the millisecond correction each loop sees to that), but updates 0.1s after 
   // every whole second so that we don't accidentally read the same Date() twice in the same second
};

// Calculate time and update display (dateNow, countdownId, eventDate)
function CD_D(n, id, e) {
	var ms = e - n;
	if (ms <= 0) ms *= -1;
	var d = Math.floor(ms/864E5);
	ms -= d*864E5;
	var h = Math.floor(ms/36E5);
	ms -= h*36E5;
	var m = Math.floor(ms/6E4);
	ms -= m*6E4;
	var s = Math.floor(ms/1E3);

	// If you want to manually customise the counter display, then edit this line:
	if (CD_OBJS[id]) {
		//CD_OBJS[id].innerHTML = d + " day" + (d == 1 ? " " : "s ") + CD_ZP(h) + "h " + CD_ZP(m) + "m " + CD_ZP(s) + "s";
		CD_OBJS[id].innerHTML = d + " day" + (d == 1 ? " " : "s &nbsp;&nbsp;") + CD_ZP(h) + ":" + CD_ZP(m) + ":" + CD_ZP(s) + "";
	}
};

// Prefix single integers with a zero
function CD_ZP(i) {
	return (i<10 ? "0" + i : i);
};

// Initialisation
function CD_Init() {
	var pref = "countdown";
	var objH = 1; // temp boolean true value
	if (document.getElementById || document.all) {
		for (var i=1; objH; ++i) {
			var id	= pref + i;
			objH	= document.getElementById ? document.getElementById(id) : document.all[id];

			if (objH && (typeof objH.innerHTML) != 'undefined') {
				var s	= objH.innerHTML;
				var dt	= CD_Parse(s);
				if (!isNaN(dt)) {
					CD_OBJS[id] = objH; // Store global reference to countdown element object
					CD_T(id, dt.valueOf());
					if (objH.style) {
						objH.style.visibility = "visible";
					}
				}
				else {
					objH.innerHTML = s + "<a href=\"http://andrewu.co.uk/clj/countdown/\" title=\"Countdown Error: Invalid date format used, check documentation (see link)\">*</a>";
				}
			}
		}
	}
};

// Get Date() object from 2006-01-01 00:00:00 GMT+00:00 date format
function CD_Parse(strDate) {
	// Pattern match to a countdown date
	var objReDte = /(\d{4})\-(\d{1,2})\-(\d{1,2})\s+(\d{1,2}):(\d{1,2}):(\d{0,2})\s+GMT([+\-])(\d{1,2}):?(\d{1,2})?/;

	if (strDate.match(objReDte)) {
		// Start with a default date and build it up into the countdown date through Date setter methods
		var d = new Date(0);

		d.setUTCFullYear(+RegExp.$1,+RegExp.$2-1,+RegExp.$3); // Set YYYY-MM-DD directly as UTC
		d.setUTCHours(+RegExp.$4,+RegExp.$5,+RegExp.$6); // Set HH:MM:SS directly as UTC

		// If there is a timezone offset specified then we need to compensate for the offset from UTC
		var tzs	= (RegExp.$7 == "-" ? -1 : 1); // Timezone sign
		var tzh = +RegExp.$8; // Get requested timezone offset HH (offset ahead of UTC - may be negative)
		var tzm = +RegExp.$9; // Get requested timezone offset MM (offset ahead of UTC - always positive)
		if (tzh) {
			d.setUTCHours(d.getUTCHours() - tzh*tzs); // Compensate for timezone HH offset from UTC
		}
		if (tzm) {
			d.setUTCMinutes(d.getUTCMinutes() - tzm*tzs); // Compensate for timezone MM offset, depending on whether the requested MM offset is ahead or behind of UTC
		}
		return d; // Date now correctly parsed into a Date object correctly offset from UTC internally regardless of users current timezone.
	}
	else {
		return NaN; // Didn't match required date format
	};
};

var CD_OBJS = new Object();

// Try not to commandeer the default onload handler if possible
if (window.attachEvent) {
	window.attachEvent('onload', CD_Init);
}
else if (window.addEventListener) {
	window.addEventListener("load", CD_Init, false);
}
else {
	window.onload = CD_Init;
}