Turtle programming help

Hey guys I'm really not so good at this turtle coding business and wouldn't mind if someone could please fix my code up it would be much appreciated thanks.

Pastebin: http://pastebin.com/6Sq7eK8V

Spoiler

–REFUEL–Slot 2 Is For Wood/Fuel
function refuel()
while turtle.getFuelLevel() == 0 do
turtle.selectSlot(2)
turtle.refuel(1)
end
end
–CHOP–Slot 2 Is Wood/Fuel
function chop()
turtle.selectSlot(2)
while turtle.comapare() == true do
turtle.dig()
turtle.digUp()
turtle.up()
else turtle.detectDown() == true
print("Can't Move Down)
else turtle.down()
end
end
end
end
–PLANT–Slot 1 Is For Saplings
function plant()
turtle.selectSlot(1)
turtle.place()
turtle.up()
end
–EMPTY
function empty()
turtle.select(3)
turtle.turnLeft()
turtle.turnLeft()
turtle.drop()
turtle.turnLeft()
turtle.turnLeft()
end
refuel()
plant()
chop()
sleep(2)
empty()

Put code in code windows and do your indentation right

What does the turtle do and what is not working

I believe that you are referring to the problem where you get error line 18 expected "end"
You cannot put a else in a while loop you will have to put a if loop where you put else

if turtle.detect==true do
  print("Can't Move Down")
else turtle.down()
end

That code ^^ will not mine the whole tree based on the way you wrote the code

To mine the whole tree you can use this

function chop()
   turtle.select(2)
   local x = 0
	  while turtle.compare()==true do
		 turtle.dig()
		 turtle.digUp()
		 turtle.up()
		 x = x+1
	  end
   for i = 1, x do
	 turtle.down()
   end
end

that should work i have not tested the code in game though so it might have a couple errors