<html><head><script type="text/javascript">function changeBorder(){ document.getElementById('myTable').border="20"}</script></head><body><table border="1" id="myTable"> <tr> <td>a</td> <td>b</td> </tr> <tr> <td>c</td> <td>d</td> </tr></table><form> <input type="button" onclick="changeBorder()" value="Change Border"></form></body></html>
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