function onOk(ddlID, hiddenFieldID, buttonID) {
    var DDL = $get(ddlID);
    var HiddenFieldID = $get(hiddenFieldID);

    //set State Key
    var button = $get(buttonID);
    HiddenFieldID.value = DDL.options[DDL.selectedIndex].value;

    //fire button click event
    if (button != null) {
        if (Sys.Browser.agent == Sys.Browser.InternetExplorer && Sys.Browser.version <= 7) {
            button.click();
        }
        else {
            $common.tryFireEvent(button, "click");
        }
    }
    return false;
}