Allora devi creare anche un frame in basso:
eccoti il codice.
Ciao,
dover


<html>
<head>
<title>
</title>
</head>
<frameset rows="100,*,50" border=0 frameborder=no>
<frame name="top" src="bottom.html" noresize scrolling=no>
<frameset cols="200,*,100" border=0 frameborder=no>
<frame name="a" src="left.html" noresize scrolling=no>
<frame name="b" src="main.html" noresize scrolling=no>
<frame name="c" src="right.html" noresize scrolling=no>
</frameset>
<frame name="d" src="bottom.html" noresize scrolling=no>
</frameset>
</html>