导航栏中加入自动弹出下拉菜单

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<!-- http://www.mb5u.com/jscode -->

<!-- bbs http://www.mb5u.com/bbs-->

 

<!-- 把下列代码加入到head区内 -->

<style type="text/css">

 

#cssdropdown, #cssdropdown ul {

padding: 0;

margin: 0;

list-style: none;

}

 

#cssdropdown li {

float: left;

position: relative;

}

 

.mainitems{

border: 1px solid black;

background-color: #FFEEC6;

}

 

.mainitems a{

margin-left: 6px;

margin-right: 8px;

text-decoration: none;

}

 

.subuls{

display: none;

width: 10em;

position: absolute;

top: 1.2em;

left: 0;

background-color: lightyellow;

border: 1px solid black;

}

 

.subuls li{

width: 100%;

}

 

.subuls li a{

text-decoration: underline;

}

 

#cssdropdown li>ul { /* to override top and left in browsers other than IE, which will position to the top right of the containing li, rather than bottom left */

top: auto;

left: auto;

}

 

#cssdropdown li:hover ul, li.over ul { /* lists nested under hovered list items */

display: block;

}

 

#restofcontent { /*wrap rest of content of the page inside this div*/

clear: left;

}

 

</style>

 

<script type="text/javascript"><!--//--><![CDATA[//><!--

startList = function() {

if (document.all&&document.getElementById) {

cssdropdownRoot = document.getElementById("cssdropdown");

for (i=0; i<cssdropdownRoot.childNodes.length; i++) {

node = cssdropdownRoot.childNodes[i];

if (node.nodeName=="LI") {

node.onmouseover=function() {

this.className+=" over";

}

node.onmouseout=function() {

this.className=this.className.replace(" over", "");

}

}

}

}

}

 

if (window.attachEvent)

window.attachEvent("onload", startList)

else

window.onload=startList;

 

//--><!]]></script>

 

 

<!-- 把下列代码加入到body区内 -->

<ul id="cssdropdown">

 

<li class="mainitems">

<a href="http://www.mb5u.com">CSS Gallery</a>

<ul class="subuls">

<li><a href="">Gordon Mac</a></li>

<li><a href="">Juiced Thoughts</a></li>

<li><a href="">The Daily Flight</a></li>

<li><a href="">GrapeFruit</a></li>

</ul>

</li>

 

<li class="mainitems">

<a href="http://www.mb5u.com/">CSS Examples</a>

<ul class="subuls" style="width: 15em">

<li><a href="">CSS2 Generated Content</a></li>

<li><a href="">Custom scrollbar colors</a></li>

<li><a href="">Markerless and "no indent" Lists</a></li>

</ul>

</li>

 

</ul>