Autohotkey - set a hotkey to toggle (disabled-enabled a hole autohotkey script)

Hi I used to use at the beginning of my Autohotkey script toggle between totally disable it and totally enable it
scrolllock:: Pause

but it doesn't work anymore, and I have realize that if I set it, it will not let me set variables. e.g.

scrolllock:: Pause
var := 29    ; <--- this var will not be set cuz the line above

It will only be set if I remove the line above, I have tested it.

I have tried to change it to...

f12::
Pause
Suspend
return

but it doesn't work with the scrollock key
I guess I need to set a keystate

How can I do this, thanks Advanced.

Answer

This code will never run

scrolllock:: Pause
var := 29
F1:: MsgBox, %var%

because you try to set a variable between hotkeys.

A variable has to be defined in the auto executable section of the script (top of the script, before the first return or hotkey)

; top of the script:
var := 29
    return      ; end of auto-execute section
scrolllock:: Pause
F1:: MsgBox, %var%

or in a hotkey

scrolllock:: Pause
F1::
var := 29
MsgBox, %var%
return

or in a function.