How to make your own character movement?

Hi,

i'm using the cel tutorial to experiment with crystal space. I already managed to swap the cally model for one of my own.
What i'm trying to do now is make my model jump. I've managed to do this but the problem with the jump function from actormove is that it checkes whether the character is on the ground or not. I want my character to be able to jump even if it isn't touching the ground. How can i manage this? I tried changing the jump function but the problem is of course that this file doesn't get compiled again.

Thanks.