// JScript File
    var HeartBeatTimer;

    function StartHeartBeat()
    {
        // pulse every 10 seconds
        if (HeartBeatTimer == null)
            HeartBeatTimer = setInterval("HeartBeat()", 1000 * 10);
    }
 
    function HeartBeat()
    {
        // note: ScriptManger must have: EnablePageMethods="true"
        Sys.Debug.trace("Client: Poke Server");
        PageMethods.PokePage();
    }