//---------------------------------------------------------------------//			
function objetoAjax(){
 var xmlhttp=false;
 try { 
   xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); }
 catch (e){
	try {
	  xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");} 
	  catch (E) {
		xmlhttp = false;}
  }
  if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
	xmlhttp = new XMLHttpRequest();
  }
  return xmlhttp;
}
//--------------------------------------------------------------------------------------
function actualizar_area(resultado,valores){
	var divResultado = document.getElementById(resultado);
	ajax=objetoAjax();
	ajax.open("POST", "_ajax.php",true);
	ajax.onreadystatechange=function() {
	if (ajax.readyState==4) {
			divResultado.innerHTML=ajax.responseText;
			//alert("hola");
			//setTimeout("focusnombre()",500);
			//alert(ajax.responseText);
			}
		}
   ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
   ajax.send(valores);
   //alert(valores);


}