div+css固定于浏览器
#bottomNav { background-color:#096; z-index:999; position:fixed; bottom:0; left:0; width:100%; _position:absolute; /* for IE6 */
_top: expression(documentElement.scrollTop + documentElement.clientHeight-this.offsetHeight); /* for IE6 */ overflow:visible; }
复制粘贴样式测试