ie6 fixed css

<!--[if lte IE 6]>
/*让position:fixed在IE6下可用!*/

.fixed-top/*头部固定*/{position:fixed;bottom:auto;top:0px;}
.fixed-bottom/*底部固定*/{position:fixed;bottom:0px;top:auto;}
.fixed-left/*左侧固定*/{position:fixed;right:auto;left:0px;}
.fixed-right/*右侧固定*/{position:fixed;right:0px;left:auto;}
/*上面的是除了IE6的主流浏览器通用的方法*/

*html,*htmlbody/*修正IE6振动bug*/
{background-image:url(about:blank);background-attachment:fixed;}

*html.fixed-top/*IE6头部固定*/
{position:absolute;bottom:auto;
top:expression(eval(document.documentElement.scrollTop));}

*html.fixed-right/*IE6右侧固定*/
{position:absolute;right:auto;
left:expression(eval(document.documentElement.scrollLeft
+document.documentElement.clientWidth-this.offsetWidth)
-(parseInt(this.currentStyle.marginLeft,10)||0)
-(parseInt(this.currentStyle.marginRight,10)||0));}

*html.fixed-bottom/*IE6底部固定*/
{position:absolute;bottom:auto;
top:expression(eval(document.documentElement.scrollTop
+document.documentElement.clientHeight-this.offsetHeight
-(parseInt(this.currentStyle.marginTop,10)||0)
-(parseInt(this.currentStyle.marginBottom,10)||0)));}

*html.fixed-left/*IE6左侧固定*/
{position:absolute;right:auto;
left:expression(eval(document.documentElement.scrollLeft));}

<![endif]-->