intervalometer on the GH-1?

Any lucky owner out there able to tell me if there is a means of shooting pics at regular intervals with the GH-1?

I wish to shoot pics every 5 seconds or so while driving (FAST!) down a motorway (freeway if you're in the US, except no-one seems to drive fast in the US anymore), in order to stitch them all together to make a short movie....

Is this possible with the GH-1?

Many compact cameras now have inbuilt intervalometers, so just wondered, before I go ahead and order mine....

Thanks for info,
PanMan55