var CerrarXmlHttp;

function ObjetoXmlHttp() {

  var TXmlHttp;
  try {
    TXmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (e1) {
     try {
        TXmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
     } catch (e2) {
        try {
        TXmlHttp = new XMLHttpRequest();
       } catch (e3) {
         TXmlHttp = false;
       }
     }
  }
  return TXmlHttp;

}

function FCerrarSesion(){

  CerrarXmlHttp = ObjetoXmlHttp();
  if(!CerrarXmlHttp)
  {
    return;
  }

  CerrarXmlHttp.open("POST" , "CerrarSesion" , false);
  CerrarXmlHttp.onreadystatechange = EstadoCerrarSesion;
  CerrarXmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  CerrarXmlHttp.setRequestHeader("Connection", "close");
  CerrarXmlHttp.send(null);
}

function EstadoCerrarSesion() {
  if(CerrarXmlHttp.readyState == 4)
  {
   location.href='index.jsp';
  }
}