It is hard to understand what you are saying, but this might help. If you are only trying to change the information in the iframe and leave the rest of the page, then this is what you might want to try. Anywhere on the page you make a link like:
<A name="DetailFrame" target="DetailFrame" href="detailspage.html">
the href is the html page that you create that contains all the detailed information. This html file will load into the iframe you created.
On the main page where you have the iframe you have to add an id and name to the iframe so the link can find it and load it into the iframe. It would look some thing like this:
<iframe id="DetailsFrame" name="DetailsFrame" frameborder="0" src="Predetails.html"></iframe>
the source (src) for the iframe would be the initial info you want loaded in. It is very important that the name you give the iframe is the same as the target in the link.
If you want the iframe to scroll, then assign the iframe a size and if the info is longer than the assigned size then it will add a scroll bar by default. To add asize it would look like this:
<iframe id="DetailsFrame" name="DetailsFrame" frameborder="0" src="Predetails.html" height="400" width="250"></iframe>
Hope this makes sense. This was the only solution I could think of based on what I think your problem is.