MIA, Ask an Expert: arrow keys

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from: Anonymous <cwj484@xxxxxxx>
date: Sun Apr 27 12:22:42 2008
platform: PC
version: MicroWorlds Ex

I am working on a maze. The down botton on my computer but not the left, 
right, or uo botton work.
to steer
t1,
make "key ascii readchar
if :key = 37 [seth 270]
if :key = 38 [seth 0]
if :key = 39 [seth 90]
if :key = 40 [seth 180]
end

to bump
t1,
forever [
if colorunder = 65 [setpos [-304 189] announce [You Lose!] stopall]
if colorunder = 105 [setpos [-304 189] announce [You Win!] stopall]
]
end


to go
setpos [-304 189]
seth 90
forever [fd 3 wait .5]
steer
bump
end

That is my proceder.
What am I doing wroung?