function applyZebra(){
	var ol_ar = document.getElementsByTagName('ol'); //todas as listas ordenadas
	for(var i in ol_ar){
		if(ol_ar[i].className=="track-list"){ //se a lista ordenada é da classe track-list
			var li_ar = ol_ar[i].getElementsByTagName('li') //pega todos os itens desta lista
			var cont = 1;
			for(var j in li_ar){
				if(cont%2){ //testa para ver se é impar
				
					li_ar[j].className = 'impar'
				}else{
					li_ar[j].className = 'par'
				}
				cont++;
			}
		}
	}	
}var req;

function loadXML(p_url){
	// Firefox, Safari, etc
	if(window.XMLHttpRequest) {
	  try {
		req = new XMLHttpRequest();
	  } catch(e) {
	  req = false;
	}
	// IE/Windows
	} else if(window.ActiveXObject) {
	  try {
		 req = new ActiveXObject("Msxml2.XMLHTTP");
	  } catch(e) {
		try {
		  req = new ActiveXObject("Microsoft.XMLHTTP");
		} catch(e) {
		  req = false;
		}
	  }
	}
	if(window.netscape) { 
		netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
	}
	if(req){
		req.open('GET', p_url, true);
		req.overrideMimeType("text/xml")
		req.onreadystatechange = function () {
			trace(req.readyState)
		  if (req.readyState == 4) {
			 if(req.status == 200){
//			  trace(req.responseText);
				if (window.XMLHttpRequest) { //not IE
					netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
				}
				var xmlResponse = req.responseXML;
				xmlResponse.ignoreWhite = true;
				if(req.responseXML){
					if(xmlResponse.documentElement){
						trace(xmlResponse.documentElement.nodeName);
						playlistParse(xmlResponse.documentElement)
					}
				}
			 }else{
			  alert("Error loading page\n");
			 }
		  }
		};
		req.send(null); 	
	}
}

function playlistParse(toptracks_node){
	trace(toptracks_node.nodeName)
	var artists = toptracks_node.getElementsByTagName('artist')
	for(var i=0; i<10; i++){
		trace(artists[i].firstChild.nodeValue)
	}
	var tracks = toptracks_node.getElementsByTagName('name')
	for(var i=0; i<10; i++){
		trace(tracks[i].nodeName)
		trace(tracks[i].firstChild.nodeValue)
	}
	
}

function loadPlaylist(){
	var url = document.getElementById('playlist_url').value;
	loadXML(url)
	return false;
}

//DEBUG
function trace(p_msg){
	document.getElementById('debug_output').value += p_msg +"\n";
}
function clearOutput(){
	document.getElementById('debug_output').value = "";
}