function xml(cadena,span,pagename)
{
	document.all(span).innerhtml='';
	var request = cadena;
	
	var xmlhttp =  new ActiveXObject("Microsoft.XMLHTTP");
	xmlhttp.open("POST",pagename,false)
	xmlhttp.setrequestheader("content-type","application/x-www-form-urlencoded");
	xmlhttp.setrequestheader("xmlpost","true");
	xmlhttp.send(request);
	
	var xmlresponse = xmlhttp.responsetext;
	var xmldom = xmlhttp.responsexml 
	
	if (xmlhttp.status == 200)
	{
		
		document.all(span).innerhtml = xmlresponse;
		return xmlresponse
	}
	else
	{
		alert('Error en la paguina')
	}
	
}