<%@ Page Language="C#" AutoEventWireup="true" CodeFile="img.aspx.cs" Inherits="img" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
    <script language="javascript" type="text/javascript">
    function doMouseMove(obj)
    {  
        obj.style.background='#99FFFF';  
        div_memo.innerText=obj.all.memo.value;
    } 

    </script>
</head>
<body>
<div  align="left" id="div_memo">
</div>
    <form id="form1" runat="server">
  
     <table>  
  <tr   class="textfield1"   onMouseMove="doMouseMove(this)"   onMouseOut="this.style.background='';   this.style.borderColor=''">  
  <td   >aaabbbccc<input   name=memo   value=aaa></td></tr>  
  <tr   class="textfield1"   onMouseMove="doMouseMove(this)"   onMouseOut="this.style.background='';   this.style.borderColor=''">  
  <td>
      aaabbbccc<input   name=memo   value=bbb></td></tr>  
  <tr   class="textfield1"   onMouseMove="doMouseMove(this)"   onMouseOut="this.style.background='';   this.style.borderColor=''">  
  <td>
      aaabbbccc<input   name=memo   value=ccc></td></tr>  
  </table>  
 
    </form>
</body>
</html>
也可以试一下 onmouseover