function ajaxFunction() 
{
  var xmlHttp;
  
  try {
   
    xmlHttp=new XMLHttpRequest();
    return xmlHttp;
  } catch (e) {
    
    try {
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      return xmlHttp;
    } catch (e) {
      
	  try {
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        return xmlHttp;
      } catch (e) {
        alert("Tu navegador no soporta AJAX!");
        return false;
      }}}
}


function Cargar(_pagina,capa) 
{
    var ajax;
    ajax = ajaxFunction();
    ajax.open("GET", _pagina, true);
    //ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

    ajax.onreadystatechange = function() {
		if (ajax.readyState==1){
			document.getElementById(capa).innerHTML = " Espere por favor...";
			     }
		if (ajax.readyState == 4) {
		   
                document.getElementById(capa).innerHTML=ajax.responseText; 
		     }
   }
			 
	ajax.send(null);
}