css 实现的居中层
[html]
<div class="tmiddle">
<i>div.tmiddle</i>
<div class="colorbox"><i>div.colorbox</i></div>
</div>
[/html]
[css]
.colorbox{
width:100px;
height:100px;
border:1px solid #2A6FA8;
background-color:#6FA5D1;
position:absolute;
top:50%;
left:50%;
margin-left:-50px;
margin-top:-50px;
}
.tmiddle{
border:1px solid #586650;
background-color:#ABB0A7;
position:relative;
height:100%;
}
[/css]
