COLGROUP
<COLGROUP> defines a group of columns in table and allows you to set properties of those columns. <COLGROUP> goes immediately after <TABLE> tag and before any <TR>. <COLGROUP> works very much like <COL>, however you must note that <COLGROUP> requires both an opening as well as a closing tag.
<TABLE BORDER=1 CELLPADDING=4 RULES=GROUPS FRAME=BOX>
<COLGROUP></COLGROUP>
<COLGROUP SPAN=3></COLGROUP>