/// <reference name="MicrosoftAjax.js"/>
function Check() {
    // Call the static page method.
    PageMethods.GetLatestHeadlineTick(OnSucceeded, OnFailed);
}

function OnSucceeded(result, userContext, methodName) {
    // Parse the page method's result and the embedded
    //  hidden value to integers for comparison.
    var LatestTick = parseInt(result);
    var LatestDisplayTick = parseInt($get('LatestDisplayTick').value);

    // If the page method's return value is larger than 
    //  the embedded latest display tick, refresh the panel.
    if (LatestTick > LatestDisplayTick)
        __doPostBack('UpdatePanel1', '');
    // Else, check again in five seconds.
    else
        setTimeout("Check()", 5000);
}

// Stub to make the page method call happy.
function OnFailed(error, userContext, methodName) { }

function pageLoad() {
    // On initial load and partial postbacks, 
    //  check for newer articles in five seconds.
    setTimeout("Check()", 5000);
}