Centering multiple movie clips?

Okay, I’m working on a dynamicly resizable photo gallery…

I’ve got all the pics loaded into thumb MCs, and everything is working…except I don’t know what the best way to center the objects is.

The closest I got was putting one MC in the center and putting one MC on one side, then the other and so on. However, this doesn’t work for odd numbers of clips…what do I do?

Thanks guys