var IntObj=null;

function endlessSessionSetTimer(interval)
{
    if(IntObj==null)
    {
	    IntObj = setInterval("endlessSessionAsyncCall()",interval);
	}
}

function endlessSessionAsyncCall()
{
	var wRequest =  new Sys.Net.WebRequest();
	wRequest.set_url("EndlessSession.aspx?r="+Math.random());  
	wRequest.set_httpVerb("GET");
	wRequest.invoke();
}