在页面左右一个悬浮div兼容IE6 IE7 8 9 Firefox chrome

#identifier-pannel {
    bottom: 345px;
    margin-left: 512px;
    position: fixed;
    _position: absolute;
    left: 50%;
    width: 110px;
    _top: expression(eval(document.documentElement.scrollTop || document.body.scrollTop) +eval(document.documentElement.clientHeight || document.body.clientHeight) -480 +‘px‘);
    z-index: 998;
}