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tabledataObject.cellIndex

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<html>
<head>
<script type="text/javascript">
function alertTd1()
  {
  alert(document.getElementById('td1').cellIndex);
  }
function alertTd2()
  {
  alert(document.getElementById('td2').cellIndex);
  }
</script>
</head>
<body>

<table border="1">
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>
<tr>
<td id="td1">Peter</td>
<td id="td2">Griffin</td>
</tr>
</table>
<br />
<input type="button" onclick="alertTd1()" 
value="Alert cell index of 'Peter'" />
<br />
<input type="button" onclick="alertTd2()" 
value="Alert cell index of 'Griffin'" />

</body>
</html>
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