All PC gamers are invited to answer my question. Click here!!!?

I have a Compaq laptop which I used to play GTA San Andreas on. On of its missions is "Cesar Vialpando". It involves you to bounce your car along with the musical beat. As usually there r no NUM keypads in laptops, my question is which controls should i use to make the car 'bounce' left, right, up & down? Thnx.