HTML/CSS/Frame Attributes/noresize
"noresize" Example
<HTML>
<head><Title>Example For</Title></head>
<frameset rows="50,*" frameborder="yes" border="20px" framespacing="5" cols="*">
<frame id="topF" name="topFrame" scrolling="NO" noresize src="http://www.wbex.ru">
<frameset cols="25%,*" border="15px" framespacing="0">
<frame name="leftFrame" marginheight="15" noresize scrolling="NO" src="http://www.wbex.ru">
<frame name="mainFrame" src="http://www.wbex.ru">
</frameset>
</frameset>
</HTML>