隐藏表格一列(ie)

<html>
<head>
</head>
<body>
<script type="text/javascript">
function hide(){
document.getElementById("colGroup1").childNodes[1].style.display = "none";
}

function show(){
document.getElementById("colGroup1").childNodes[1].style.display = "block";
}
</script>

<table border="1" width="100%" id="table1">
    <colgroup id="colGroup1">
        <col/>
        <col/>
        <col/>
    </colgroup>
<tbody>
    <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
    </tr>
    <tr>
        <td>a</td>
        <td>b</td>
        <td>c</td>
    </tr>
</tbody>
</table>
<p>
<input type="button" value="1" name="B3" onclick="hide();">
<input type="button" value="2" name="B4" onclick="show();">
</p>

<body>
</html>
,在firefox下如何通过colgroup中的col元素来实现隐藏列,还没有搞定

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