ie6 支持fixed

* html,* html body /* 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; right: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));}