漂亮折叠 展开 隐藏 jQuery 下拉菜单

       

<div class=wpn_wrapper>
<div class=wpn_right>
<span class=wpn_heading2> Friends 

 <A class="wpn_toggle-expand wpn_toggle-hide wpn_wpn_toggle-hide" href="#"></A> </span>
<div style="DISPLAY: block" class="wpn_box wpn_expandable">
<div class=textwidget>
<div>
<A href="#"> <B>学无止境?</B></A> <br>
<A href="#"> <B>学?无?止?境?</B></A> <br>
<A href="#"> <B>学?无?止?境?</B></A> <br>
<A href="#"> <B>学?无?止?境?</B></A> <br>
<A href="#"> <B>学?无?止?境?</B></A> <br>
<A href="#"> <B>学?无?止?境?</B></A> <br>
<A href="#"> <B>学?无?止?境?</B></A> <br>
</div>
</div>
</div>
<div class=wpn_clear></div>
<div class=wpn_box-bottom></div>
</div>
</div >

<style type="text/css">
a img {border:0;}
.wpn_clear {clear:both;}
a {text-decoration:none;color:#fff;}
a:hover{text-decoration:none;}
body {background:#000 url(img/bg.jpg) repeat-x top center;font-family:Arial;font-size:12px;}
.wpn_right {float:right;width:300px;overflow:hidden;}
.wpn_right .wpn_heading2:first-child {margin-top:0;}
.wpn_right .wpn_box {padding:5px;background:#222 url(img/box_bg.gif) repeat-x top;float:left;width:290px;}
.wpn_right .wpn_box-bottom {background:url(img/box_bottom.gif) repeat-x top;height:10px;-moz-border-radius-bottomleft:3px;-moz-border-radius-bottomright:3px;margin-bottom:15px;clear:both;}
.wpn_heading2 {display:block;width:300px;height:42px;background:url(img/heading_right.gif);font-size:16px;line-height:40px;font-weight:bold;text-transform:uppercase;text-indent:10px;position:relative;color:#999;margin-top:15px;}
.wpn_heading2 a.wpn_toggle-expand {display:block;width:28px;height:27px;background:url(img/toggle_right.gif) no-repeat 0 0;line-height:27px;text-indent:-999px;overflow:hidden;position:absolute;top:7px;right:7px;outline:none;}
.wpn_heading2 a.wpn_toggle-hide {background-position:-28px 0;}
.wpn_heading2 a.wpn_toggle-show {background-position:0 0;}
.wpn_heading2 a {color:#999;}
.wpn_heading2 a img {display:none;}
</style>

<script src="Script/jquery-1.4.min.js" type="text/javascript"> </script>

 jQuery(document).ready(function(){
jQuery("a.wpn_toggle-expand").each(function(i) {
var div = jQuery(this).parent('span').next('div.wpn_expandable');
jQuery(this).click(function(e){
e.preventDefault();
if(jQuery(div).css('display')=='none') {
jQuery(this).removeClass('wpn_toggle-show');
jQuery(this).addClass('wpn_wpn_toggle-hide');
}
else {
jQuery(this).removeClass('wpn_wpn_toggle-hide');
jQuery(this).addClass('wpn_toggle-show');
}
div.slideToggle("slow");
});
});

 });

2011-5-21 update：

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