// This javascript tags file downloads and external links in Google Analytics.

if (document.getElementsByTagName) {
    // Initialize external link handlers
    var hrefs = document.getElementsByTagName("a");
    for (var l = 0; l < hrefs.length; l++) {
        // try {} catch{} block added by erikvold VKI
        try {
            //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|docx|xls|xlsx|ppt|pdf|zip|txt|vsd|vxd|rar|exe|tar|gz|ashx|epub)($|\&|\?)/);
                var isImg = path.match(/\.(?:gif|eps|jpg|png|svg|bmp|jpeg|psd|tiff)($|\&|\?)/);
                var isMov = path.match(/\.(?:wma|mov|avi|wmv|mp4|webm|flv)($|\&|\?)/);
                var isMus = path.match(/\.(?:mp3|m4a|wav|aac|ogg)($|\&|\?)/);
                var isSys = path.match(/\.(?:js|css|xml)($|\&|\?)/);

                if (isDoc) {
                    startListening(hrefs[l], "click", trackDocumentLinks);
                } else if (isImg) {
                    startListening(hrefs[l], "click", trackImageLinks);
                } else if (isMov) {
                    startListening(hrefs[l], "click", trackMovieLinks);
                } else if (isMus) {
                    startListening(hrefs[l], "click", trackMusicLinks);
                } else if (isSys) {
                    startListening(hrefs[l], "click", trackSystemLinks);
                }
            }
            else {
                startListening(hrefs[l], "click", trackExternalLinks);
            }
        }
        catch (e) {
            continue;
        }
    }
}

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 (_gaq) == "object") _gaq.push(['_trackEvent', 'Mailto', mailto]);
}

function trackDocumentLinks(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 (typeof (_gaq) == "object") _gaq.push(['_trackEvent', 'Document Download', lnk]);
}

function trackImageLinks(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 (typeof (_gaq) == "object") _gaq.push(['_trackEvent', 'Image Download', lnk]);
}

function trackMovieLinks(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 (typeof (_gaq) == "object") _gaq.push(['_trackEvent', 'Movie Download', lnk]);
}

function trackMusicLinks(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 (typeof (_gaq) == "object") _gaq.push(['_trackEvent', 'Music Download', lnk]);
}

function trackSystemLinks(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 (typeof (_gaq) == "object") _gaq.push(['_trackEvent', 'System File Download', lnk]);
}

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 = e.hostname + lnk;
    if (typeof (_gaq) == "object") _gaq.push(['_trackEvent', 'External Link', lnk]);
}