//	This javascript tags file downloads and external links in Google Analytics.
//	You need to be using the Google Analytics New Tracking Code (ga.js) 
//	for this script to work.
//	To use, place this file on all pages just above the Google Analytics tracking code.
//	All outbound links and links to non-html files should now be automatically tracked.

if(document.getElementsByTagName)
{
	// Initialize external link handlers
	var hrefs = document.getElementsByTagName("a");

	for(var l = 0 ; l < hrefs.length ; l++)
	{
		//protocol, host, hostname, port, pathname, search, hash
		if(hrefs[l].protocol == "mailto:")
		{
			startListening(hrefs[l],"click",trackMailto);
		}
		else if(hrefs[l].hostname == location.host)
		{
			var path = hrefs[l].pathname + hrefs[l].search;
			var isDoc = path.match(/(?:doc|eps|jpg|png|svg|xls|ppt|pdf|xls|zip|txt|vsd|vxd|js|css|rar|exe|wma|mov|avi|wmv|mp3)($|\&)/);
			
			if(isDoc)
			{
				startListening(hrefs[l],"click",trackExternalLinks);
			}
		}
		else
		{
			startListening(hrefs[l],"click",trackExternalLinks);
		}
	}
}

function startListening(obj,evnt,func)
{
	if(obj.addEventListener)
	{
		obj.addEventListener(evnt,func,false);
	}
	else if(obj.attachEvent)
	{
		obj.attachEvent("on" + evnt,func);
	}
}

function trackMailto(evnt)
{
	var href = (evnt.srcElement) ? evnt.srcElement.href : this.href;
	var mailto = "/mailto/" + href.substring(7);
	
	if(typeof(pageTracker) == "object") pageTracker._trackPageview(mailto);
}

function trackExternalLinks(evnt)
{
	var e = (evnt.srcElement) ? evnt.srcElement : this;

	while(e.tagName != "A")
	{
		e = e.parentNode;
	}

	var lnk = (e.pathname.charAt(0) == "/") ? e.pathname : "/" + e.pathname;

	if(e.search && e.pathname.indexOf(e.search) == -1) lnk += e.search;

	if(e.hostname != location.host) lnk = "/external/" + e.hostname + lnk;

	if(typeof(pageTracker) == "object") pageTracker._trackPageview(lnk);
}