//    Javascript to tag file downloads and external links in Google Analytics
//    To use, place reference to this file should be placed at the bottom of all pages, 
//    just above the Google Analytics tracking code.
//    All outbound links and links to non-html files should now be automatically tracked.
//    possible reference: http://www.goodwebpractices.com/roi/track-downloads-in-google-analytics-automatically.html
if (document.getElementsByTagName) 
{
    // Initialize external link handlers
    var hrefs = document.getElementsByTagName("a");
    
    for (var l = 0; l < hrefs.length; l++) 
    { 
        if (hrefs[l].href.length > 0)
        {
            //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|pdf|xls|ppt|zip|txt|vsd|vxd|js|css|rar|exe|wma|mov|avi|wmv|mp3|xml|rtf)($|\&)/); 
                
                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); 
}