function Confirm() {
    if ($("#ddlReturnSchoolyear").combobox('isValid')) {
        var windowID = $.SystemGeneral.getUrlParam("WindowID");
        var schoolyearID = $("#ddlReturnSchoolyear").combobox('getValue');

        top.$("#" + windowID).data("resultData", schoolyearID);
        top.$("#" + windowID).dialog("close");
    }
}