Js点击弹出下拉菜单效果实例

<STYLE type=text/css>
.menu { BORDER-RIGHT: #006080 2px solid; BORDER-TOP: #80e0ff 2px solid; LEFT: 0px; VISIBILITY: hidden; BORDER-LEFT: #80e0ff 2px solid; BORDER-BOTTOM: #006080 2px solid; POSITION: absolute; TOP: 0px; BACKGROUND-COLOR: #40a0c0 }
A.menuItem { BORDER-RIGHT: #000000 0px solid; PADDING-RIGHT: 12px; BORDER-TOP: #000000 0px solid; DISPLAY: block; PADDING-LEFT: 8px; FONT-WEIGHT: bold; FONT-SIZE: 8pt; PADDING-BOTTOM: 2px; BORDER-LEFT: #000000 0px solid; CURSOR: default; COLOR: #ffffff; PADDING-TOP: 2px; BORDER-BOTTOM: #000000 0px solid; FONT-FAMILY: MS Sans Serif, Arial, Tahoma, sans-serif; TEXT-DECORATION: none }
A.menuItem:hover { COLOR: #ffff00; BACKGROUND-COLOR: #004060 }
</STYLE>
<DIV class=menu id=myMenu><A class=menuItem
href="https://www..net"></A> <A class=menuItem
href="http://www.baidu.com">百度</A> <A class=menuItem
href="">网 易</A> <A class=menuItem
href="">江苏音符</A> <A class=menuItem
href="">央视国际</A> </DIV>
<P><font onclick="openMenu(event, 'myMenu');return false;">点击打开菜单</font></P>
<SCRIPT type=text/javascript>
document.getElementById("myMenu").onmouseout = closeMenu;
function openMenu(event, id) {
var el, x, y;
el = document.getElementById(id);
if (window.event) {
x = window.event.clientX + document.documentElement.scrollLeft
+ document.body.scrollLeft;
y = window.event.clientY + document.documentElement.scrollTop +
+ document.body.scrollTop;
}
else {
x = event.clientX + window.scrollX;
y = event.clientY + window.scrollY;
}
x -= 2; y -= 2;
el.style.left = x + "px";
el.style.top = y + "px";
el.style.visibility = "visible";
}
function closeMenu(event) {
var current, related;
if (window.event) {
current = this;
related = window.event.toElement;
}
else {
current = event.currentTarget;
related = event.relatedTarget;
}
if (current != related && !contains(current, related))
current.style.visibility = "hidden";
}
function contains(a, b) {
// Return true if node a contains node b.
while (b.parentNode)
if ((b = b.parentNode) == a)
return true;
return false;
}
</SCRIPT> </td>
   </tr>
 </table>