Thanks Widi for answering me ....
I am not using c_move... I am using:
if(key_space) mov.z+=8*time_step;
and
pXent_movechar(me, mov, nullvector, 0);

to move it but whenever I press the space it doesn't move up?? I uploaded the file.. I just wanna know what is wrong...

here's the file again
http://www.mediafire.com/?6qodxbb08r1ls4z