function trackDownload(link) {
	var isNav = (navigator.appName.indexOf("Netscape") != -1);
	var targetURL = (isNav) ? link.target.href : event.srcElement.href;
	var file = targetURL.split("/");
	file = file[file.length - 1];
	file = "/downloads/" + file;
	urchinTracker(file);
}

function addOnDownloadTracker() {
	if (document.getElementById && document.createElement && document.appendChild) {
		var links = document.getElementsByTagName("a");
		for (var i=0; i<links.length; i++) {
			if (links[i].href.indexOf(".zip") > -1 && !links[i].onclick){
				links[i].onclick = trackDownload;
			}
		}
	}
}