<html><head><script type="text/javascript">function addCell(){ var x=document.getElementById('myTable').rows[0] var y=x.insertCell(2) y.innerHTML="NEW CELL"}</script></head><body><table id="myTable" border="1"><tr><td>d</td><td>d</td></tr><tr><td>d</td><td>d</td></tr><tr><td>1</td><td>2</td></tr></table><form><input type="button" onclick="addCell()" value="Add cell"></form></body></html>
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