Heh, you had the same idea as me. You making something like a character switching system I guess? Just make it a common event and set it as a paralell process. I had to add alot of other stuff to make it work right though, so if you have trouble I can show you how I did it. Also, is this for an ABS? More info pl0x.
...Or you could be doing something completely different, in which case I wish you luck!