Help: runtime image import in Flash CS3?

I’m creating an “online logo-maker” application.
I want to:
(a) have a “library” of bitmap & vector objects a user can drag onto the “work area”;
(b) have user-specific libraries. I’m planning on using PhP or ASP for the user to be able to upload bitmap & vector images to the server (they will be converted on the fly to WMF and put in a folder Flash can get to). I want the Flash (cs3) application to be able to reference that folder of images so the user can also drag those onto his “work area”.
© Also, want admins to have capability to add to the main library.
Is any/all of this a runtime possibility? I don’t even know where to get started so if you have ideas, please share!