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<SCRIPT LANGUAGE="JavaScript">
<!--
var display = false;
function fn(){
if(display){
document.getElementById('ChildMenu1').style.display = "none";
display = false;
}
else {
document.getElementById('ChildMenu1').style.display = "";
display = true;
}
}
//-->
</SCRIPT>
<ul style="display:none" id="ChildMenu1">
<li>子菜单 </li>
<li>子菜单 </li>
<li>子菜单 </li>
</ul>
<input type="button" value="display&show" onclick="fn()"/>