I have 40 PNG files with layers. There are 3 areas in the PNG files (logo, navigation bar, and text area) that need to be setup as [variables] inside of flash.
The flash file will be the same thing as the original PNG except that now we can pass variables to flash. So if the user inserts text on our backend form, it will now show up in the flash file. IF the user submits their logo, it will now show up in the flash file. IF the user submits new titles for his navigation bar, it will be passed and show up in flash.
So these SWFs are like templates. Basic background, website layout - but those three elements are now made into variables for dynamic data.
Simple work. Open up PNG - copy into FLASH. Make the logo area a variable, make each navigation bar title an variable, and make the text area a variable.
SAve as FLA, and export as SWF.