Well, wasn't that very impressive? That was accomplished simply by writing the link thusly:
<a href="content2.html" target="content">open page 2</a>
Where content was the name given to the right frame.
To see the frameset code for this layout, click View > Source in your browser. To see the source code of the pages contained in the frameset, you have to right-click them and select View Source.
Click here to re-open the first page (or just press Back in your browser).