让页脚永远停靠在页面底部

 #Footer
        {
            clear: both;
            background: #F8F8F8 url('images/toolbar_bg.gif') repeat-x;
            z-index: 99999;
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            overflow: visible;
        }