Headlight wiring problem?

For instance I turn my lights on (both out lights are on as they should be) But when I flick the switch for brights the drivers side dies right out or sometimes only the low beam will work..... but sometimes they will all 4 be on at once and be fine.
I have no idea why it is being like this..... I have tried unplugging them and replugging em all back in.... but it doesn't seem to fix it!
Are there ANY ideas as to what is going on? A relay or something going bad?
Its really starting to **** me off!!!

P.S. not trying to bash but save the avatar for myspace or facebook bud.
I'll change it to something more suting for the forum

I really doubt the bulbs are goin out.... they look fairly new
change your dimmer switch bud then im pretty sure all will be good.
I have no idea which relay it is I should check either.
Don't know why..... it just doesn't seem like it would be a dimmer switch.
If it just so happens to be a dimmer switch, where can I get one and about how much would it be?

