[CODE]
function ShowMenu(vMnuCode,tWidth) {
vSrc = window.event.srcElement;
vMnuCode = "<table cellspacing=1 cellpadding=3 style='width:"+tWidth+"' class='menu' onmouseout='HideMenu()'><tr height=23><td nowrap align=left class=MenuBody>" + vMnuCode + "</td></tr></table>";
h = vSrc.offsetHeight;
w = vSrc.offsetWidth;
l = vSrc.offsetLeft + leftMar+1;
t = vSrc.offsetTop + topMar + h + space-2;
vParent = vSrc.offsetParent;
while (vParent.tagName.toUpperCase() != "BODY")
{
l += vParent.offsetLeft;
t += vParent.offsetTop;
vParent = vParent.offsetParent;
}
menuDiv.innerHTML = vMnuCode;
menuDiv.style.top = t;
menuDiv.style.left = l;
menuDiv.style.visibility = "visible";
isvisible = true;
//makeRectangularDropShadow(submenu, MENU_SHADOW_COLOR, 4)
}[/CODE]

用JAVA 或者层之类的都可以实现啊