请问如何通过JS改变表格的背景图片？

Question

<table width=100 heigh=100 border=1 id=aa>
<tr>
<td>sf
</td>
</tr>
</table>
<SCRIPT LANGUAGE="JavaScript">
<!--
aa.background = "http://community.csdn.net/images/CSDN_logo.GIF";
//-->
</SCRIPT>

Answer 1

or<SCRIPT LANGUAGE="JavaScript">
<!--
document.all.aa.style.backgroundImage  = "url(http://community.csdn.net/images/CSDN_logo.GIF)";
//-->
</SCRIPT>

Answer 2

function shownative(obj)
{
document.all('bgtable').style.backgroundImage='url(kuang/top.jpg)';
}
function showinternational()
{
document.all('bgtable').style.backgroundImage="url(kuang/top.jpg)";
}

Answer 3

var ttt=document.getElementsByTagName("table");
ttt[0].style.backgroundImage='url(xxx.jpg)';