Wierd if-statement ')' error

I have this pice of Code(in the program digQuader:

function turn(dir, height)
  if(dir = "right") then --on this line it says ')' expected!
    turtle.turnRight()
    turtle.forward()
    ...
  end
end

that gives me the error: bios:338: [string "digQuader"]:20: ')' expected

I really can't figure out what's wrong.
Can anyone help?

all comparions need to be "=="


function turn(dir, height)
if(dir == "right") then
turtle.turnRight()
turtle.forward()
…
end
end

Shame on me!
I don't know how i didn't notice that. I literally sat there about half an hour trying to figur it out.
Thanks anyways.

when i am tire i make little mistakes too like yours, everyone does it. if it hasnt been done already i want to make some sort of syntex checker program and if it returns an error it fixes it automatically for me, that would be very nice and have alot of hours for everyone when attemping to debug their programs, esp when a single program gets greater than 200 lines like some of mine that i have. =(

maybe i can start working on something like that right now =) *inspiration fired*