<ul><li onmousemove="xianshi('wang')" onmouseout="yincang('wang')"><a href="#">鼠标扑捉</a><ul><li id="wang" style=" 200px; height:200px; background:#CCC;"> <a href="#">显示与隐藏</a></li></ul></li>
<li onmousemove="xianshi('hh')" onmouseout="yincang('hh')"><a href="#">鼠标扑捉</a><ul><li id="hh" style=" 200px; height:200px; background:#CCC;"> <a href="#">显示与隐藏</a></li></ul></li>
</ul>
</div>
<script type="text/javascript">
function xianshi(emlt){
document.getElementById(emlt).style.visibility='visible';
}
function yincang(emlt){
document.getElementById(emlt).style.visibility='hidden';
}
</script>