Ermmmm - I began to lose it a little after a while...do you just mean horizontal frames? something like...

<frameset cols='x%,y%'>
    <frameset rows="a%,b%,c%">
        <frame name='menu_button_1'>
        <frame name='menu_button_2'>
        <frame name='menu_button_3'>
    </frameset>
    <frame name='results'>
</frameset>
[download]

You could try posting an example URL to make it a little clearer.
Cheers,
Ben