如何在页面中制作弹出菜单

<input name="test" type="button" value="Come" onmouseover="showMenu(flow,this)"><div id="flow" style="position:absolute;z-index:60p;width:50;font-size:12px;background:#FFFFE1;display:none" align="center"  onmouseover="this.style.display=''" onmouseout="this.style.display='none'">
<a href="#">搜狐</a><br>
<a href="#">网易</a><br>
<a href="#">新浪</a><br>
<a href="#">雅虎</a><br>
</div>
<SCRIPT LANGUAGE="JavaScript">
<!--
function showMenu(obj,test) {
var strTop=0;
parentObj=event.srcElement;
while (parentObj)
{
strTop+=parentObj.offsetTop;
parentObj=parentObj.parentElement;
if (parentObj.tagName=="BODY")
{
break;
}
}
for (i=0;i<1000000;i++) {}
flow.style.display='';
obj.style.pixelLeft=event.x;
obj.style.pixelTop=strTop+test.offsetHeight;
obj.style.border="solid 1px black";
}
//-->
</SCRIPT>