Flash 8 + frames difficulties

Hi all, not sure whether i ought to be posting in the newbie forum but here goes.

Alright, in previous versions of flash I have been able to do this. Basically all it is, is a website using iframes. Instead of using html for the navigation however, I embed a flash file up top in order to get an animation in as well as the functionality of a navigation bar.

In html frames document, i have this tag
<iframe name = "mainFrame" src = "home.htm" width height etc. noresize></iframe>

in the flash, my action script in the button is,

on (release) {
getURL ("home.htm", "mainFrame");
}

now when i go to index.htm and click on the flash buttons, it brings up home.htm, but in a different window (a pop up).
Before in previous versions, it would just change the contents of "mainFrame" the name of my iframe, to home.htm, why is this?

:S has anybody else ever had this problem?!?!?

and is there a difference between flash 8 and flash basic 8? because when the loading screen comes up i see flash basic 8

this post has been gathering dust for somtime, but just to let anyone else no who might come across this problem, upload it and it should work fine.

Cheers
Aidan