html {
_background-image: url(about:blank);_background-attachment: fixed; /* prevent screen flash in IE6 */
}
div{
overflow: visible;
position: fixed;
top: 50px;
_position: absolute; /*IE6 用absolute模擬fixed*/
_top: expression(documentElement.scrollTop + 50 + "px"); /*IE6 動態設置top位置*/
}