function nuevoAjax(){
	var xmlhttp=false;
	 try {xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");}
	 catch (e) {
		try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");} 
		catch (E) {	xmlhttp = false;}//end catch
	 }//end catch

	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
	 xmlhttp = new XMLHttpRequest();
	}
	return xmlhttp;
}//end ajax