/*
Javascript helper functions for Zymurgy:CM (www.zymurgycm.com).
*/
function ZymurgyFactory() {
	this.lightAJAX = function(url,onComplete) {
		var req;
		if (window.XMLHttpRequest) {
			req = new XMLHttpRequest();
		}
		else if (window.ActiveXObject) {
			req = new ActiveXObject("Microsoft.XMLHTTP");
		}
		else {
			//No AJAX available...
			return;
		}
		req.open('get',url,true);
		req.onreadystatechange = function() {
			if (onComplete)
				onComplete(req);
		};
		req.send(null);
	};
	
	this.getparam = function (name)
	{
		name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
		var regexS = "[\\?&]"+name+"=([^&#]*)";
		var regex = new RegExp( regexS );
		var results = regex.exec( window.location.href );
		if( results == null )
			return false;
		else
			return results[1];
	}
	
	this.track = function(userid) {
		var url = "/zymurgy/tracking.php?r="+escape(document.referrer)+"&u="+userid;
		var tag = this.getparam('zcmtag');
		if (tag)
		{
			url += "&t="+escape(tag);
		}
		if (document.cookie.indexOf("zcmtracking")==-1)
		{
			var expTicks = 1000 * // milliseconds
				60 * // seconds
				60 * // minutes
				24 * // hours
				365* // days
				10;  // years
			var exp = new Date();
			exp.setTime(exp.getTime() + expTicks);
			var setTrackingCookie = function(req) {
				var trckid = req.responseText;
				document.cookie = "zcmtracking="+trckid+"; expires="+exp.toGMTString() + "; path=/;";
			};
			this.lightAJAX(url,setTrackingCookie);
		} else {
			this.lightAJAX(url);
		}
	};
	return this;
};

var Zymurgy = ZymurgyFactory();