Can I transfer albums/folders from one iPhone gallery to another another (different macs)

I have two MacBook's running Lion. I need to give one back to work, so I want to move all the albums and folders I set up in my iPhoto on my work MacBook to my personal MacBook. I also have a few thousand photos organized into albums/folders on my personal MacBook. Is there some way to easily merge these without destroying my albums and organization? I've tried once, and it was a disaster....all my albums disappeared and all the photos were just thrown into a general Photos folder.

Any help is appreciated!

Thank you,

Andrea