As I said before, you stick a philips head screw driver into that slot on the adjuster pictured on the right and turn in like a perpendicular gear setup. /ubbthreads/images/graemlins/dunno.gif
For the philips screw head on the left, yes, that is an adjuster. If you were to remove that headlight, you would see that the left adjuster philips screw is actualy just a philips screwdriver itself on the other end, and is doing the same thing that putting a screwdriver in the right adjuster would do. What you have to watch out for on the left adjuster is corrosion preventing something from turning. The parts that hold the adjusters together are all plastic, so if you try to adjust it when it is stuck solid, you will snap the plastic retainers and the adjuster will be broken.
Sorry, I can't find the words to describe it any better. Just stick a philips screwdriver in the right adjuster and you'll see what I mean.