HTML/CSS/Frame Attributes/cols
"cols" specifies the number of columns and the size of the columns in a frameset
<source lang="html4strict">
<html> <head> </head> <frameset rows="50,*" frameborder="yes" border="20px" framespacing="5">
<frame name="topFrame" scrolling="NO" noresize src="http://www.wbex.ru"> <frameset cols="20%,*" border="15px" framespacing="0"> <frame name="topFrame" noresize scrolling="NO" src="http://www.wbex.ru"> <frame name="mainFrame" src="http://www.wbex.ru">
</frameset> <noframes> <body>no frames</body> </noframes> </html>
</source>