how to disable right click view the .zul page property..?

<device-config>
        <device-type>ajax</device-type>
        <!-- configures zk to reload the page if timeout happnes -->
        <timeout-uri></timeout-uri>
        <!-- configure zk to automatic reload timeout-uri without requireing a event from user -->
        <automatic-timeout/>
        <!-- Custom javascript snippets -->
        <embed>
            <![CDATA[<script type="text/javascript">
            <script language=JavaScript>
                //Disable right mouse click Script
                //By Maximus ([email protected]) w/ mods by DynamicDrive
                //For full source code, visit http://www.dynamicdrive.com

                function clickIE4(){
                    if (event.button==2){
                        return false;
                    }
                }

                function clickNS4(e){
                    if (document.layers||document.getElementById&&!document.all){
                        if (e.which==2||e.which==3){
                            return false;
                        }
                    }
                }

                if (document.layers){
                    document.captureEvents(Event.MOUSEDOWN);
                    document.onmousedown=clickNS4;
                }
                else if (document.all&&!document.getElementById){
                    document.onmousedown=clickIE4;
                }

                document.oncontextmenu=new Function("return false");
            </script>

            ]]>
        </embed>
    </device-config>