如何利用IFRAME实现图片滚动呢?很急,请帮忙啊。

就是IFRAME放5张图片但是只先显示3张另外2张一上一下,可以在IFRAME外加两个图片控制IFRAME的滚动,从而实现图片的滚动。很急,请帮忙。
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scroll.htm

1<iframe name="in" src="in.htm"></iframe>
1<div align="center" style="height:130px;width:243px;">
2<script>var timer;</script>
3<br/>
4<input onmousedown="timer1=setInterval('parent.frames[\'in\'].scrollBy(0,-1)',10)" onmouseup="clearInterval(timer1)" type="button" value="up"/>
5<input onmousedown="timer1=setInterval('parent.frames[\'in\'].scrollBy(0,1)',10)" onmouseup="clearInterval(timer1)" type="button" value="down"/>
6</div>

in.htm

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