Ohh I see. So what you gonna have is 3 frames total. One main on the left and the other one split into 2 horizontal frames. In this case you can do something like this:

First Page (should be a frameset too)
Code:
<HTML>
<FRAMESET COLS="20%,*" FRAMEBORDER="0" BORDER="false">
	<FRAME SRC="MainPage.htm" SCROLLING="auto" name=Main>
	<FRAME SRC="Frameset.htm" SCROLLING="no" name=Frameset>
</FRAMESET>

<BODY>

</BODY>
</HTML>

Frameset page:
Code:
<HTML>
<FRAMESET ROWS="20%,*" FRAMEBORDER="0" BORDER="false">
	<FRAME SRC="TopPage.htm" SCROLLING="auto" name=TopPage>
	<FRAME SRC="Page2.htm" SCROLLING="no" name=Page2>
</FRAMESET>

<BODY>

</BODY>
</HTML>

MainPage.htm
Code:
<HTML>
</BODY>
<BR><BR>

<!--By specifying the target, the page would be loaded appropriately-->
<A HREF=Link1.htm target=Page2>Link 1</A>
<A HREF=Link2.htm target=Page2>Link 2</A>
<A HREF=Link3.htm target=Page2>Link 3</A>
<A HREF=Link4.htm target=Page2>Link 4</A>
<A HREF=Link5.htm target=Page2>Link 5</A>

Regards,