图片代替滚动条,控制层的上下滚动

<div style="width:220;height:130;overflow:hidden;border:1 solid black" id="TextScrollBox">
<div style="position:relative;top:0" id="TextScroll">
<iframe src="http://www.163.com"/ style="height:900"></iframe>
</div>
</div>
<img onmouseover="MoveTextDiv(this,'up')">
<img onmouseover="MoveTextDiv(this,'down')">
<script>
<!--
function MoveTextDiv(obj,action){//上下移动层
function UpMove(){
if(TextScroll.offsetTop<0){
TextScroll.style.pixelTop+=1;
}
}
function DownMove(){
if(TextScroll.offsetTop>(TextScrollBox.offsetHeight-TextScroll.offsetHeight)){
TextScroll.style.pixelTop-=1;
}
}
scro=setInterval(action=="up"?UpMove:DownMove,10);
function obj.onmouseout(){
clearInterval(scro);
}
}
-->
</script>
http://www.flashvml.com/bbs/