页面上怎么添加左移右移按钮？

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<TITLE>控制表格内的滚动条-51windows.Net－www.51windows.Net</TITLE>
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<META NAME="Author" CONTENT="51windows,海娃,haiwa">
<META NAME="Description" CONTENT="Power by 51windows.Net">
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      <td rowspan="3"><div id="wins" style="height:200;width:200;overflow:auto;background:#EEEEEE;">
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      <td valign="top"><span onmouseover='scrollb=setInterval("wins.scrollLeft-=10",100)' onmouseout=clearInterval(scrollb)>左</span>　　<span onmouseover='scrollb=setInterval("wins.scrollTop-=10",100)' onmouseout=clearInterval(scrollb)>上</span></td>
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      <td></td>
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      <td valign="bottom"><span onmouseover='scrollb=setInterval("wins.scrollLeft+=10",100)' onmouseout=clearInterval(scrollb)>右</span>　　<span onmouseover='scrollb=setInterval("wins.scrollTop+=10",100)' onmouseout=clearInterval(scrollb)>下</span></td>
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