<!--
var intervalId;
keep_session_alive();
intervalId = setInterval('keep_session_alive()',900000); //every 15 minutes

function GetXmlHttpObject()
{
  var xmlHttp=null;
  try
    {
    // Firefox, Opera 8.0+, Safari
    xmlHttp=new XMLHttpRequest();
    }
  catch (e)
    {
    // Internet Explorer
    try
      {
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
    catch (e)
      {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    }
  return xmlHttp;
}


function keep_session_alive(){
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null){
		//alert ("Your browser does not support AJAX!");
		if (intervalId != null) clearInterval(intervalId);
		return;
	}   

	var url="/cu/education/session_alive.jsp";
	url=url+"?sid="+Math.random();
	xmlHttp.onreadystatechange=function () {}
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);  
}
     //-->