EnablePrimaryMouseButtonEvents(true);

function OnEvent(event, arg)
if IsKeyLockOn("numlock" )then
if IsMouseButtonPressed(3)then
repeat
if IsMouseButtonPressed(1) then
repeat
MoveMouseRelative(-1,2)
Sleep(14)
until not IsMouseButtonPressed(1)
end
until not IsMouseButtonPressed(3)
end
end
end