My sliding glass doors were installed upside down. How do I fix this?

All of the sliding patio doors in my condo complex were installed upside down. That means that my sliding glass door is on the outside and the screen on the inside. I want to install a a pet door but I am having a hard time making it work while still being able to use and lock both doors. The rollers, doors and tracks seem to be in good condition so I hate to just replace them completely. Anyone have any ideas or suggestions?