function topnav_over(nav, new_class) {
  nav.className = new_class;
}

function list_over(nav, new_class) {
  document.getElementById(nav).className = new_class;
}


// Urchin tracking code for documents and external links

function setupUrchinTracking() {
	var links       = document.getElementsByTagName('a');
	var track_files = new Array('.pdf', '.doc', '.PDF', '.DOC');

	var setup_link;
	for (var i = links.length; i != 0; i--) {
		setup_link = false;
		var a = links[i-1];
		if (!a.href) continue;
		
		// Track external links
		if(a.href.indexOf('http') != -1 &&
            a.href.indexOf(window.location.hostname) == -1){
			setup_link = true;
		}else{
			// Track documents
			for(var f = 0; f < track_files.length; f++){
				if(a.href.indexOf(track_files[f]) == (a.href.length - track_files[f].length)){
					setup_link = true;
					break;
				}
			}
		}
		
		if (setup_link){
			a.onclick = function() {
                track_url(this.href);
                return true;
            }
            
		}
	}
}

function track_url(href) {
	if(window.urchinTracker){
		urchinTracker(href);
	}
}