function ValidateLogOff(logOffUrl, dialogID) {
    $.ajax({
        type: "POST",
        url: "/Services/BasketWebService.asmx/HasDirtyItems",
        data: "{}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (result) {
            if (result.d) { LogOffDialog(logOffUrl, dialogID); }
            else { LogOff(logOffUrl); }
        },
        error: function (error) {
            LogOff(logOffUrl);
        }
    });
}

function LogOff(url)
{
    window.location = url;
}

function LogOffDialog(url, dialogID) {
    var oWnd = $find(dialogID);
    oWnd.show();
}