function Toolbarclick_handler(sender, eventArgs) {
    var toolBar = sender;
    var button = eventArgs.get_item();
    var commandname = button.get_commandName();
    var OK = true;

    if (commandname == "Exit")
        OK = confirm("Weet u zeker dat u het scherm wilt verlaten?");

    return OK;
}

function ShowImageManager(editorID, callbackFunction) {
    return ShowEditorDialog(editorID, 'ImageManager', callbackFunction);
}

function ShowEditorDialog(editorID, dialogName, callbackFunction) {
    var editor = $find(editorID);
    return editor.showDialog(dialogName, '', callbackFunction);

    function ShowPreview(ID) {
        window.open('/default.aspx?page=cms&id=' + ID, 'Bekijken', 'width=1024,height=800,menubar=false,toolbar=false');
    }

}