[新手]怎么使一个对象上的触发事件改变另外一个对象的值？
js新手做一个按钮，将鼠标事件设在了table上，而控制按钮样式的class设在td上，请问这个鼠标事件该如何控制td上的class改变？
代码如下
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<table   border= "0 "   cellpadding= "0 "   cellspacing= "0 "   class= "fBtnSize "   onmouseover= "btnover(); "   onmouseout= "btnout(); "   onmousedown= "btndown(); "   onmouseup= "btnup(); ">
    <tr>
        <td   align= "center "   class= "fBtnABl "> </td>
        <td   align= "center "   class= "fBtnAB "> 确认 </td>
        <td   align= "center "   class= "fBtnABr "> </td>
    </tr>
</table>
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btnover()，btnout()，btndown()，btnup()这组函数该如何获取几个td上的对象？

------解决方案--------------------
<table id= "table1 " border= "0 " cellpadding= "0 " cellspacing= "0 " class= "fBtnSize " onmouseover= "btnover(); " onmouseout= "btnout(); " onmousedown= "btndown(); " onmouseup= "btnup(); ">
<tr>
<td align= "center " class= "fBtnABl "> </td>
<td align= "center " class= "fBtnAB "> 确认 </td>
<td align= "center " class= "fBtnABr "> </td>
</tr>
</table>
<script language= "javascript ">
var obj=document.getElementById( "table1 ");
var obj_tr=obj.rows(0); //第一行
for (i=0;i <obj_tr.childNodes.length;i++)
alert(obj_tr.childNodes(i).className);
</script>