Turtle Recognizing Arrow Keys i press

Hi,i'm trying to compile a program like this: It's a bit boring let the turtle advance 1 block,then 1 more,1 more…so,what about if turtle could recognize Arrow Keys i press and react moving?
It should move forward with Up Arrow
Backward with Down Arrow…
Turn left and right with Left and Right arrows

How to do this?

while true do
local event,param = os.pullEvent("key")
if param == [KEY#] – where [KEY#] is the number of the arrow key you want (up = 200, down = 208, left = 203, right = 205)
then

end
end

This half works,if i put

while true do
local event,param = os.pullEvent("key")
if param == [203] -- where [KEY#] is the number of the arrow key you want (up = 200, down = 208, left = 203, right = 205)
then
turtle.turnLeft()
end
end

This as first string,it will only turn left but i wrote all other 3 strings (200,208 and 205)

Some fix? What about

elseif

You don't have to put the []. It should look like this:

while true do
  local evt, key = os.pullEvent("key")
  if key == 200 then -- Up
    turtle.forward()
  elseif key == 208 then -- Down
    turtle.back()
  elseif key == 203 then -- Left
    turtle.turnLeft()
  elseif key == 205 then -- Right
    turtle.turnRight()
  end
end

You may want to add some keys to go up/down, place/dig blocks and some way to exit the program.

Thank you a LOT!!! This works fine,and now i can move my turtle a lot easier :)/>/>
Another little question: How can i shrink turtle's GUI? It's a bit invasive,i can't see where my turtle goes

On singleplayer, you can go to your mod config file, and you will see options for turtle display size. Dunno if this works for multiplayer though, I doubt it.