getURL to open in iframe?

ok my problem is that ive made a button with a getURL but i want the page to be opened in my frame in my html page.

To see what i mean, www.norinker.com .

I want the “artwork” button to open up the page in the middle frame of the index.html.

Im pretty new to flash scripting, but logically i guess it would be:
[ARTWORK]
getURL(“http://www.norinker.com/images/photoshop/index.html”, “_mainFrame”)

and in my index.html, the name of the frame would be <name=“mainFrame”>

Does this make sense?