Small Basic Temperature Conversion

start:
TextWindow.Write("Fahrenheit to Celcius? (Type 1) or Celcius to Fahrenheit? (Type in 2): ")
selection = TextWindow.Read()
If selection = "1" Then
TextWindow.Write("Enter temperature in Fahrenheit: ")
fahr = TextWindow.ReadNumber()
celsius = 5 * (fahr-32) / 9
TextWindow.WriteLine("Temperature in Celcius is " + celsius)
Else
TextWindow.Write("Enter temperature in Celcius: ")
celsius = TextWindow.ReadNumber()
fahr = (celsius * 9/5) + 32
TextWindow.WriteLine("Temperature in Fahrenheit is " + fahr)
EndIf
TextWindow.Write("Go again? y/n : ")
repeatchoice = TextWindow.Read()
If repeatchoice = "y" Then
  Goto start
  Else
  EndIf