Keep Pages In Iframe - But Load Correct Page?

The Site:
The long lists of content works best in an iframed site.

I wanted to make sure that search engines grab all pages, but load them into the iframe.

So I'm using this:
<script language="JavaScript" type="text/javascript">

</script>

The Issue:

It works fine, but of course when a page is clicked from a search it naturally loads the iframed site, but at the index page.

What I'd like to do:

I'd like it if the correct page could load into the iframe...example:
User clicks whateverpage.html, and whateverpage.html is the one loaded correctly into the iframe that is located on the index.html page.

Is there another script that can accomplish this? I've looked and looked and can't find anything even in reference to this.

I don't want to use a frameset.