Need help with squat form

dr3w_s

Hi guys, I need help with my squat form, I'm currently doing starting strength and I'm stuck at 95kg and I started to feel abit of pain or sore in my right knee, not right on my kneecap but more on the joint. I wonder if anybody here can point out what have I done wrong.
http://www.youtube.com/watch?v=BIC2DhtnVVQ

thanks alot guys!