var functionlater;
function XHConn()
{
  var xmlhttp, bComplete = false;
  try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); }
  catch (e) { try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); }
  catch (e) { try { xmlhttp = new XMLHttpRequest(); }
  catch (e) { xmlhttp = false; }}}
  if (!xmlhttp) return null;
  this.connect = function(sURL, sMethod, sVars, fnDone)
  {
    if (!xmlhttp) return false;
    bComplete = false;
    sMethod = sMethod.toUpperCase();

    try {
      if (sMethod == "GET")
      {
        xmlhttp.open(sMethod, sURL+"?"+sVars, true);
        sVars = "";
      }
      else
      {
        xmlhttp.open(sMethod, sURL, true);
        xmlhttp.setRequestHeader("Method", "POST "+sURL+" HTTP/1.1");
        xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      }
      xmlhttp.onreadystatechange = function(){
        if (xmlhttp.readyState == 4 && !bComplete)
        {
          bComplete = true;
          fnDone(xmlhttp);
        }};
      xmlhttp.send(sVars);
    }
    catch(z) { return false; }
    return true;
  };
  return this;

}

/*

function page(targetId,url,params) {
target= document.getElementById(targetId);
target.innerHTML = 'Espere...';
var myConn = new XHConn();
    if (!myConn)alert("XMLHTTP not available. Try a newer/better browser.");
    var query = function (oXML) {  target.innerHTML = oXML.responseText; };
    myConn.connect(url, "POST", params, query);
}
*/
//________________________________________________________________________________________________________________________

function page(targetId,url,params,mensaje) {
	target= document.getElementById(targetId);
	
	if (mensaje.length > 0){
		if (mensaje == " ") {
			target.innerHTML = "Espere...";	
		}else{
			target.innerHTML = mensaje;
		}
	}
	
	var myConn = new XHConn();
    if (!myConn) alert("XMLHTTP not available. Try a newer/better browser.");
    
    var query = function (oXML) {
			
								if (oXML.status == 200){	//La respuesta http debe ser ok (200) 	
									
									regreso = oXML.responseText;
									if (regreso.length > 0){
										target.innerHTML = oXML.responseText;
										
									}
									
									if (typeof(functionlater) == "string"){
										
										var fun = functionlater;
										functionlater = null;
										eval(fun);
										
									}
									
								}else{
									//El servidor dió un error.
								}
	};
	
    myConn.connect(url, "POST", params, query);
}
//________________________________________________________________________________________________________________________