Hi, there are different way to do so. If you will take a look at the html code of your frameset for example:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://forums.xisto.com/no_longer_exists/;
<html>
<head>
<title>Unbenanntes Dokument</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<frameset rows="*,700,*" frameborder="NO" border="0" framespacing="0">
<frame src="top.htm" name="topFrame" scrolling="NO" noresize >
<frameset cols="*,960,*" frameborder="NO" border="0" framespacing="0">
<frame src="left.htm" name="leftFrame" scrolling="NO" noresize>
<frame src="f0_00.htm" name="mainFrame">
<frame src="right.htm" name="rightFrame" scrolling="NO" noresize>
</frameset>
<frame src="bot.htm" name="bottomFrame" scrolling="NO" noresize>
<frame src="UntitledFrame-5" name="bottomFrame" scrolling="NO" noresize>
</frameset>
<noframes><body>
</body></noframes>
</html>
You are able to fix the size of frames:
<frameset rows="*,700,*" frameborder="NO" border="0" framespacing="0">
Within thsi row the middle frame is fixed on 700 pixel and the others will fit to the screen.
Maybe this will help to fix your problem. So if you fix the Mainframe and unfix your right frame the problem might be solved!
Maybe you can post your frameset, so I can give you some further advice.
Good luck
Daniel