jump problem

Hi everybody..

in this link:

http://www.2shared.com/file/5222552/71637de2/programming_random.html

i start make a character walks with right key, then when collision the red square, character jump over it, i success in doing that, but there is still a problem..when you run the game,if you press right key (ONCE)(when character left of red square only) the character jump then walks 32px..!

i trying a lot using upon pressing key, but i failed..
greeting
MFA