head light's are pretty cool, if you rip out yoru headlight bulp you will see what i mean, there isnt 1 element inside of the bulb, there is 2, when the headlight is put onto a certain possition, e.g. normal, it will put only 1 of the elements on, and when it's on highbeam, it simply put's both of them on, they are called a duel element bulb, (prety technical name hey) if one blow's, the other one will glow realy dull, it's as simple as that, replace the bulb, and all will be fine, but be very very carefull, like old mate above said, dont touch the new globe glass, what you should to is put some paper over the top of the bulb when you put it in, to prevent oil from yoru finger's getting onto it, what the oil does is creates a hot spot as the oil heats up, over a period of about 2 weeks it will slowly deform the glass bulb and simply blow the guts out of it,
enjoy
cheers
garth