<HEAD> <SCRIPT src=tableDom.js> </SCRIPT> <SCRIPT> function doIt() { var cg = document.getElementsByTagName("COLGROUP")[0]; var refCol = document.getElementsByTagName("COL")[1]; var col = document.createElement("COL", null); col.width = 200; cg.insertBefore(col, refCol); } </SCRIPT> </HEAD> <BODY onload="doIt()"> <table bgcolor=orange border> <colgroup> <col width=100> <col width=300> </colgroup> <tr> <td>100</td><td>200</td><td>300</td> </tr> </table> </BODY></HTML>