/*
This javascript file tags each link to an external site, document for download, or email address 
to be tracked by Google Analytics.
*/

if (document.getElementsByTagName) {

    try {

    // 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].href)
            continue;
        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|exe|jpg|pdf|png|ppt|svg|vsd|xls|zip)($|\&)/);
            if (isDoc) {
                startListening(hrefs[l], "click", trackDownloads);
            }
        } else {
            startListening(hrefs[l], "click", trackExternalLinks);
        }
    }

}
catch (err) {
}

}


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);
}

function trackDownloads(evnt) {
    var href = (evnt.srcElement) ? evnt.srcElement.href : this.href;
    var download = "/download/" + href;
    if (typeof (pageTracker) == "object")
        pageTracker._trackPageview(download);
}