Turtle Mineshaft Program Error... Help Please?

Hi, I am pretty new to coding in Lua so I thought I'd start with something simple… and then I got this error: bios:206: [string "mineshaft"]:3: '=' expected

My code (done in notepad ++):

–Create a mineshaft
print("Creating your mineshaft, Press any key to stop")
While true do
turtle.digdown()
turtle.down()
turtle.turnright()
turtle.dig()
turtle.forward()
turtle.turnleft()
turtle.dig()
turtle.forward()
turtle.turnleft()
turtle.dig()
turtle.forward()
turtle.turnright()
turtle.dig()
turtle.forward()
turtle.turnright()
turtle.dig()
turtle.turnleft()
turtle.back()
sleep(1)
end
if event == "key" then
break
end

lua's case sensitive, your functions should be turnLeft(), digDown() etc.

Thanks a million, I was silly not to notice that xD

Ok, so now I have fixed that, I have two issues:
1) my attempt at the press any key to stop even doesn't work even when I put it into the loop (probably missing something obvious again xD)
2) the turtle doesn't stop digging when it reaches bedrock, if just carries on digging a 2 wide, 1high tunnel (basically it carries on without descending as it should at the begining of the loop), how on earth do I tell the turtle to stop if it can't mine the block bellow it at the begining of the loop?? xD

Thanks

Script as it is now:

–Create a mineshaft
print("Creating your mineshaft, Press any key to stop")
while true do
turtle.digDown()
turtle.down()
turtle.turnRight()
turtle.dig()
turtle.forward()
turtle.turnLeft()
turtle.dig()
turtle.forward()
turtle.turnLeft()
turtle.dig()
turtle.forward()
turtle.turnRight()
turtle.dig()
turtle.forward()
turtle.turnRight()
turtle.dig()
turtle.turnLeft()
turtle.back()
sleep(0)
if event == "key" and param1 then
break
end
end

This looks promising but I'm not sure about the try down bit:

local function tryDown()
if not turtle.down() then
if turtle.digDown() then
if not collect() then
return false
end
end
if not turtle.down() then
return false
end
end