$(document).ready(function() {
    // grab each link on the page
    $('a').each(function() {

        // extract the link address from the link
        var strLink = $(this).attr("href");

        // check if its a link to one of our list
        if (IsLocalTrackableLink(strLink)) {

            // add an onclick method to it
            $(this).click(function() {
                // run the google page view function
                pageTracker._trackPageview(strLink);
            });
        }
    });
});

function IsLocalTrackableLink(linkUrl) {
    // check that a link is not null, local, 
    // and contains our file extensions
    if (linkUrl != null &&
        linkUrl.indexOf("http://") < 0 &&
            linkUrl.match( /\.(?:doc|xls|pdf|zip|rar|exe|mp3)($|\&|\?)/ )) {
        return true;
    }
    return false;
}