Movement problem(with Input.KeyDown)

[Barda4]

I am having trouble getting my sprite to move. I get it so he just stands there, but he doesn't move. Here the code.
I think it's all that's needed I don't know for sure.

loop
Input.KeyDown (chars)
end loop
if chars (KEY_RIGHT_ARROW) then
fork linkwalkright
chright := true
chleft := false
chup := false
chdown := false
elsif chars (KEY_LEFT_ARROW) then
fork linkwalkleft
chleft := true
chright := false
chup := false
chdown := false
elsif chars (KEY_UP_ARROW) then
fork linkwalkup
chup := true
chright := false
chleft := false
chdown := false
elsif chars (KEY_DOWN_ARROW) then
fork linkwalkdown
chdown := true
chright := false
chleft := false
chup := false
end if

[CodeMonkey2000]

Umm...put the end loop at the end of your porgram.