滑块固定顶部

①始终顶部

<div id="d1" style="position:absolute;background:#eeeeee;border:1px dotted #000;">
<div><img src="..."/></div>
<div>content</div>
</div>
<script type="text/javascript">
function scrollImg(){
    var posX,posY;
    if (window.innerHeight) {
        posX = window.pageXOffset;
        posY = window.pageYOffset;
    }
    else if (document.documentElement && document.documentElement.scrollTop) {
        posX = document.documentElement.scrollLeft;
        posY = document.documentElement.scrollTop;
    }
    else if (document.body) {
        posX = document.body.scrollLeft;
        posY = document.body.scrollTop;
    }
 
    var ad=document.getElementById("d1");
    ad.style.top=(posY+100)+"px";
    ad.style.left=(posX+50)+"px";
    setTimeout("scrollImg()",100);
}
scrollImg();
</script>

 注意:不能写在jQuery里