Enable GUI Scripting

if enabledGUISCripting(true) then
    -- GUI Scripting statements go here
    display dialog "GUI Scripting is enabled"
else
    --non-GUI scripting statements go here
    display dialog "GUI Scripting is disabled"
end if

on enabledGUISCripting(switch)
    tell application "System Events"
        activate
        if not (UI elements enabled) then set (UI elements enabled) to true
        return (UI elements enabled)
    end tell
end enabledGUISCripting