var req;
function cargaXML(url) {
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
		req.onreadystatechange = processReqChange;
		req.open("GET", url, true);
		req.send(null);
	} else if (window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req) {
			req.onreadystatechange = processReqChange;
			req.open("GET", url, true);
			req.send();
		}
	}
}
function processReqChange(){
	var contenido = document.getElementById("continguts");
	if(req.readyState == 4){
		contenido.innerHTML = req.responseText;
	} else {
		contenido.innerHTML = '<img src="loading.gif" align="middle" /> Loading...';
	}
}