as far as frames go in html, you put a "target" frame for the page to go into.
meaning, if your anchor tag is like this for an example:
<a href="nextpage.php3" target="frame_name">click here to open new php3 page in frame #2</a>
( so you name your frame with a name )
like thus:
<frame name="second" src="main_page.html">
the frame on the right or left is called "second"
hope this helps if not you know more about frames.