//    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.
//
//  +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//    Created by:     Colm McBarron, colm.mcbarron@iqcontent.com
//    Last updated:     12-Feb-2006
//
//    Updated by:        Niamh Phelan niamh.phelan@iqcontent.com
//    On:                22-Jul-2008
//    For:            Upgrade to ga.js    
//
//    Updated by:        Peter McKenna peter.mckenna@iqcontent.com
//    On:                07-Nov-2008
//    For:            Track mailto: links and restructure how virtual
//                  pageviews are structured
//
//    Updated by:        Peter McKenna peter.mckenna@iqcontent.com
//    On:                19-Feb-2009
//    For:            Fixed up some problems with how Internet 
//                    Explorer 6 was tracking links, and some minor
//                    Firefox issues.
//    +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
var hrefs = document.getElementsByTagName("a");
var link_path = "";

for (var l = 0; l < hrefs.length; l++) {
        try {
            // Add the hostname and link location into variables
            var link_path = hrefs[l].pathname;
            var link_location = String(hrefs[l]);

            // Check if it's a mail link
            if (link_location.match(/^mailto:/i)) 
            {
                addmailtotrackerlistener(hrefs[l]);
            }
            // Check to see if the link is an internal link
            else if (location.host == hrefs[l].hostname) 
            {
                if(link_path.match(/\.(doc|pdf|xls|ppt|zip|txt|vsd|vxd|js|css|rar|exe|wma|mov|avi|wmv|mp3)$/)) 
                {
                    addtrackerlistener(hrefs[l]);
                }
            }
            else 
            {
                addtrackerlistener(hrefs[l]);
            }
        }
        catch(err) 
        { 
            //var my_err = err.description;
            //alert(my_err);
        }
}


// Add a listener to matching file links
function addtrackerlistener(obj) {
    if (obj.addEventListener) {
        obj.addEventListener('click', trackfiles, true);
    } else if (obj.attachEvent) {
        obj.attachEvent("on" + 'click', trackfiles);
    }
}


// Add a special listener to mailto: links
function addmailtotrackerlistener(obj) {
    if (obj.addEventListener) {
        obj.addEventListener('click', trackmailto, true);
    } else if (obj.attachEvent) {
        obj.attachEvent("on" + 'click', trackmailto);
    }
}


function trackPage(file_path) {
    // pageTracker._trackPageview(file_path);
    urchinTracker(file_path);
}


// Track file links
function trackfiles(array_element) {
    var file_path = "";
    // Track an external link
    var destination_host = (array_element.srcElement) ? array_element.srcElement.hostname : this.hostname;
    if (location.host != destination_host){
        file_path = "/virtual/exlink/";
        //file_path += cleanURL(window.location, true) + '/' + ((array_element.srcElement) ? array_element.srcElement.hostname : this.hostname);
        file_path += ((array_element.srcElement) ? array_element.srcElement.hostname : this.hostname);
        file_path += ((array_element.srcElement) ? "/" + cleanURL(array_element.srcElement.pathname, false) : this.pathname);
    }
    // Track an internal link
    else {
        file_path = ((array_element.srcElement) ? "/" + cleanURL(array_element.srcElement.pathname, false) : this.pathname);    
        //var file_details = file_path.split('/');
        //file_path = cleanURL(window.location, true) + '/' + file_details[(file_details.length-1)];
        //file_path =  (("/virtual/download/") + file_path);
    }
    trackPage(file_path);
}

// Generate page view for a mailto: link
function trackmailto(array_element) {
    var email = ((array_element.srcElement) ? array_element.srcElement.href : this.href).substring(7);
    //var url = cleanURL(window.location, true);
    var mail_path = '/virtual/mailto/'+email;
    trackPage(mail_path);    
}

// Clean leading & trailing slashes
function cleanURL (url, end) {
    var url = url.toString();
    var urlLen = url.length;
    
    if (end) {
        if (url.charAt((urlLen-1))=='/')
            url = url.substring(0,(urlLen-1));
    }
    else {
        if (url.charAt(0)=='/')
            url = url.substring(1,urlLen);
    }
    return url;
}