Your Fascinate came with an SD card right? Basically do this...
1. Take your BB SD card and put it into your fascinate
2. Connect your Fascinate to your computer with the USB cable
3. Once it's connected, go to Windows Explorer. The Fascinate will show up as a removable drive.
4. Create a new folder on your desktop called "BB SD Card"
5. Go to the removable drive, select all of the folders, copy, then paste into the new folder on your desktop.
6. Once everythign is copied over, disconnect the phone from the computer, then replace the BB SD card with the Fascinate SD card
7. Connect the phone to the computer again
8. Copy the photos from the desktop folder(probably in the DCIM folder) into the newly mounted SD card(don't know where the ringtones would be).
9. enjoy your migrated images and ringtones.
In a nutshell...