<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Essai</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <script type="text/javascript" language="javascript"> function remove_col2() { var colp = document.getElementById("colp"); var c4= document.getElementById("c4"); colp.colSpan=0; colp.style.display="none"; c4.style.display="none"; } function remove_col() { var tr1 = document.getElementById("tr1"); var tr2 = document.getElementById("tr2"); var tr3 = document.getElementById("tr3"); var colp = document.getElementById("colp"); var c1 = document.getElementById("c1"); var c2 = document.getElementById("c2"); var c3 = document.getElementById("c3"); var c4= document.getElementById("c4"); c1.style.display="none"; colp.colSpan=1; c3.style.display="none"; c2.style.display="none"; document.documentElement.offsetHeight; remove_col2(); } </script> </head> <body onload="remove_col()"> <table border="1" id="t_0"> <thead> <tr id="tr1"> <th rowspan="2">aaaa</th> <th rowspan="2">bbbb</th> <th colspan="2" id ="colp">cccc</th> <th rowspan="2">dddd</th> </tr> <tr id="tr2"> <th id="c1">eeee</th> <th id="c2">ffff</th> </tr> </thead> <tbody> <tr id="tr3"> <td>1111</td> <td>2222</td> <td id="c3">3333</td> <td id="c4">4444</td> <td>5555</td> </tr> </tbody> </table> </body> </html>