Need advice from flash, php xml, mysql expert

okay i’ve got a friend who is a commercial real estate agent. he’s wanting a website with a property listing. this would include some type of dashboard/user interface where he can add/delete listings and fill in the details, upload a photo, etc.

I’ve built a flash file that reads from simple xml file and will build a listing and populate an mc with all the listings…etc.

what i’m wondering is a.) should I continue trying to build this with XML/flash/PHP or should I look at MYSQL instead