function nuevoAjax()
{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 Enviar(_pagina,capa){var ajax;ajax=nuevoAjax();ajax.open("GET",_pagina,true);ajax.setRequestHeader("If-Modified-Since","Thu, 1 Jan 1970 00:00:00 GMT");ajax.send(null);ajax.onreadystatechange=function()
{if(ajax.readyState==4){document.getElementById(capa).innerHTML=ajax.responseText;}}}