function add_pdf_tracking() {
	hyperlinks = document.getElementsByTagName('a');
	for (var i = 0; i < hyperlinks.length; i++) {
		var href = hyperlinks[i].href;
		if (href.substring(href.length - 4).toLowerCase() == '.pdf') {
			hyperlinks[i].onclick = function() {
				_gaq.push(['_trackEvent', 'Downloads', 'PDFs', this.title+' ('+getRootRelativeURL(this.href)+')']);
			}
		}
	}
}

function getRootRelativeURL(url) {
	var urlparts = url.split('/');
	var relativeurl = '';
	if (urlparts.length > 3) {
		for (var j = 3; j < urlparts.length; j++) {
			relativeurl += '/'+urlparts[j];
		}
	}
	return relativeurl;
}