div+css打造可变高宽的圆角框

<div id="m_category" class="round2">
<h3>管理中心</h3>
<div class="con">
<p><a href="Categorymanager.aspx">类别管理</a></p>
<p><a href="Newsmanager">新闻管理</a></p>
<p><a href="Addnews">添加新闻</a></p>
</div>
<div class="footer">
<p> </p>
</div>
</div>

{
padding:0;
margin:0;
}
body
{
font-size:14px;
}
a:link, a:visited
{
color: #000;
text-decoration: none;
}
a:hover
{
color: #00f;
text-decoration: underline;
}
#m_category
{
width:200px;
}
#m_category .con p
{
padding:10px;
}
.round2
{
background-image:url("../images/round2_left_.gif");
background-position: left;
background-repeat:no-repeat;
}
.round2 h3
{
background:url("../images/round2_right_.gif") no-repeat right;
padding-left:35px;
padding-:12px;
padding-bottom:12px;
font-size:16px;
font-weight:bold;
}
.round2 .con
{
height:200px;
padding:0 20px;
background:url("../images/round2_right_middle.gif") repeat-y right;
}
.round2 .footer
{
background:url("../images/round2_left_bottom.gif") no-repeat bottom left;
}
.round2 .footer p
{
background:url("../images/round2_right_bottom.gif") no-repeat bottom right;
}