IE6中的position:fixed定位兼容性写法分享

/* 修正IE6振动bug */
html,* html body{background-image:url(about:blank);background-attachment:fixed;}
/* IE6 头部固定 */
html .fixed-top{position:absolute;bottom:auto;top:expression(eval(document.documentElement.scrollTop));}
/* IE6 右侧固定 */
html .fixed-right{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));}
/* IE6 底部固定 */
html .fixed-bottom{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)));}
/* IE6 左侧固定 */
* html .fixed-left{position:absolute;right:auto;left:expression(eval(document.documentElement.scrollLeft));}