求一个简单的js

Question

一个多行表格
要求鼠标经过一个单元格 该单元格背景色变为红

Answer 1

<table id="ok"> 
<tr> 
<td>111111 </td> 
</tr> 
<tr> 
<td>222222 </td> 
<td>333333 </td> 
<td>44444444 </td> 
</tr> 
<tr> 
<td>aaaaaaa </td> 
<td>ssssssss </td> 
<td>dddddddd </td> 
<td>fffffffff </td> 
</tr> 
</table> 
<script type="text/javascript"> 
var mytab=document.getElementById("ok");
var tr=mytab.rows;
for(i=0;i<tr.length;i++){
for(j=0;j<tr[i].cells.length;j++){
tr[i].cells[j].onmouseover=Function("this.style.background='#FF0000'");
tr[i].cells[j].onmouseout=Function("this.style.background='#FFFFFF'");
}
}
</script> 

Answer 2

要在TD加哦...
<td onmouseover="this.style.background='red'" onmouseout="this.style.background='white'">