求javascript高手帮忙！

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script language="javascript">
    <!--Begin Code
    function over(obj)
    {
        obj.bgColor="red";
obj.background="imgurl";
obj.style.fontStyle="italic";
//.........
    }

function out(obj)
{
   obj.bgColor="";
   obj.style.fontStyle="normal";
   //.........
}
    //End Code
    // -->
</script>
</HEAD>
<BODY>
<table border=1>
  <tr>
    <td onmouseover="over(this)" onmouseout="out(this)">Test</td><td>Test</td>
  </tr>
</table>
</BODY>
</HTML>其它属性要改变参考 DHTML手册