// example output of this function: onclick="pageTracker._trackPageview('/oxfamnews/pdf/december_2007.pdf');"
// it adds that to every a href that has a filetype listed in var extensions.

// We dont want the try adding the tracking code until the page links are loaded
if (document.addEventListener) {
	document.addEventListener("DOMContentLoaded", addEvents, null); // Firefox
}
else {
	addEvents(); // IE : Call the function immediately because the script is referenced with the defer attribute supported by IE
}

function addEvents() {
	// quit if this function has already been called
	if (arguments.callee.done) {
		return;
	}
	// flag this function so we don't do the same thing twice
	arguments.callee.done = true;
	for (i=0; i <document.links.length; i++) {
		var x = document.links[i];
		// Only attach tracking code to specific file types
		// var extensions = new RegExp(".+\.(zip|pdf|xls|doc|ppt|rtf|mov|avi|mpg|wmv|mp3|wma|rss)$");
		var extensions = new RegExp(/(\.)(zip|pdf|xls|doc|ppt|rtf|mov|avi|mpg|wmv|mp3|wma|rss)(\?)?/);
		//var extensions = new RegExp(/.+.(zip|pdf|xls|doc|ppt|rtf|mov|avi|mpg|wmv|mp3|wma|rss)(\?dep_id=(\d+))?$/);
		var doc = x.href.toLowerCase().match(extensions);
		if (doc) {
			if (x.attachEvent) {
				x.attachEvent('onclick', function () {TrackIt(window.event.srcElement)}); // IE
			}
			else {
				x.addEventListener('click', function () {TrackIt(this)}, false); // Firefox
			}
		}
	}
}

function TrackIt(link) {
	pageTracker._trackPageview(link.href);
}