CSS 置底浮動footer

#bottombar { 

 background-color: #efefec; 

 position: fixed; !important; 

 width: 100%; 

 bottom: 0; 

 z-index: 5; 

 height: 34px; 

 border: 1px solid #999999; 

 background-repeat:repeat-x; 

 color:#FFFFFF; 

 _position:absolute; 

 _top:expression(document.body.scrollTop+document.body.clientHeight-this.clientHeight); 

 }