Itunes deleting my stuff

[o7ryan]

Whenever i try to sync a video to my ipod, it automatically deletes everything else. Can i fix that?

 

[Matthew Yohe]

http://www.apple.com/itunes/how-to/#video-sync

 

[spinnerlys]

It has to be checked.

 

[o7ryan]

It has to be checked.

It is checked, this still pops up:
Are you sure you want to sync movies? All existing songs, movies, and TV shows on your iPod will be removed and replaced with movies from your iTunes library.