//	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-2010
//	For:			Fixed up some problems with how Internet 
//					Explorer 6 was tracking links, and some minor
//					Firefox issues.
//	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//

// Check analytics installed (some affilates dont). If it is proceed.
if (typeof (pageTracker) != 'undefined' && pageTracker != null) {
    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) { }
    }
}

// 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);
    }
}


// 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/" + cleanURL(window.location, true) + '/' + ((array_element.srcElement) ? array_element.srcElement.hostname : this.hostname);
        file_path = file_path + ((array_element.srcElement) ? "/" + cleanURL(array_element.srcElement.pathname, false) : this.pathname);
    }
    // Track an internal link
    else {
        file_path = ((array_element.srcElement) ? "/" + array_element.srcElement.pathname : 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);
    }
    pageTracker._trackPageview(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/' + url + '/' + email;
    pageTracker._trackPageview(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;
}