Lookup Thumbnails?

[AAHH]

I currently use FMP 5.5. I would like to have a button next to a field (container) in data entry, that would allow the user to see a pop-up "lookup" of thumbnails of photos in a related database. Then he could just pick the photo that he wants and the current database container field would be linked to (and display) that photo. In essense, a glorified "browse" button like everyone uses to pick/select/or save a file when using virtually any OS and application.

This option is not available in 5.5 (that I know of). Is it available in 6 or 7?

Also, I have heard that it is not real easy to convert 5.5 solutions to 7. Is that a valid concern?

Thanks