thanks for replying to me.
actually i added the platform behavior to the object.
and when i press UP key, the object jumps fine, but i want to add some animation to the object to prepare the object (Person) for jumping.
but this animation is taking effect in the fly.
So what I thought of was, to give it some time to wait before jumping, so in this wait time the (Preparation to Jump) animation simulate the object as it's really jumping.
I tried to add wait action on (Key Up is down) event, but it seems to be not working.