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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>