Simple stuff - using frames

This is a very simple question as I am a student trying my hand at a
simple rails app. How do you use html frames inside the RoR scaffold.
I can set the frame structure with no problem - but I am not sure how
to point each frame to a .rhtml file.

I tried this code just playing around

<frameset rows="10%,50%">
  <frame src="menu.rhtml">
  <frameset cols="50%,50%">
    <frame src="frame_b.htm">
    <frame src="frame_c.htm">
  </frameset>
</frameset>

but I get the following error in each frame
Routing Error

no route found to match "/menu.rhtml" with {:method=>:get}

I'm not sure how to set the routing obviously

Thanks to anyone who can help me