Need some help 'end' expected (to close 'while' at line 3)

Hey i've been having a bit of trouble with my lift design. I keep getting this problem error [string 'startup']:8: 'end' expected (to close 'while' at line 3).
[attachment=622:lift programming.rtf]
Any help would be greatly appreciated.

x = 13
if rs.getInput("top") then
while x >= 0 do
  rs.setOutput("left", true)
  sleep(0.5)
  rs.setOutput("left", false)
  sleep(0.5)
  return x = x - 1
  else os.reboot()
end
end

Please use code tags next time :D/>/>

The problem is that you are using an else while there is no if, you can't do that.

Yea sorry about that i'm new to this forum :D/>/>
I've tried it without the else and with a repeat instead of the while and it gives the same error

Post your whole script or tell me what you want your script to do

That is the whole script as of now. Basically when i press a button i want it to trigger the lift to take me down thirteen floors. Im starting to think tht maybe a repeat-until function would be more useful.

x = 13
if rs.getInput("top") then
repeat
  rs.setOutput("left", true)
  sleep(0.5)
  rs.setOutput("left", false)
  sleep(0.5)
  return x = x - 1
  until x == 0
end

But this gives me 'until' expected to close 'repeat' at line 3

x = 0
if rs.getInput("top") then
while x ~= 13 do
  rs.setOutput("left",true)
  sleep(0.5)
  rs.setOutput("left",false)
  sleep(0.5)
  x = x+1
end
end

I think this script will do the trick :D/>/>

x = 13
if rs.getInput("top") then
   for i=1,x do
	  rs.setOutput("left",true)
	  sleep(0.5)
	  rs.setOutput("left",false)
	  sleep(0.5)
   end
end

If you don't actually plan on using 'x' to collect an input, then remove 'x = 13' and then change 'for i=1,x do' to 'for i=1,13 do'

ah brilliant that works perfectly thanks alot! :D/>/>