Event.onDOMReady( function() {
	var pdflinks = $$('.pdf');
	var rsslinks = $$('.rss');
	var doclinks = $$('.doc');
	var pptlinks = $$('.ppt');
	var otherlinks= $$('.track-analytic');

	var links = [pdflinks, rsslinks, doclinks, pptlinks, otherlinks];

	links.each(function(linktype) {
		linktype.each(function(link){
			Event.observe(link, 'click', downloadAnalyticRegister)
		});
	});
});	

function downloadAnalyticRegister(event) {
	var linkString = new String(this).replace("http://precedings.nature.com/", ""); // removing host from URL for Urchin
	urchinTracker(linkString);
}