please help ...problem with vsync! :(

Hello, I wanted to ask about a problem I am having with my MacBook Air 11" ...it is equipped with an Intel HD 3000, problem is that I have horrible screen tearing in 3 of my games: Quake 4, Doom 3 and UT2004 ...those are the only games (from my 20+ games) where I cannot turn on vsync no matter what I do.

I am very new to the world of "Mac" and since there is no settings screen for the video card I wanted to ask how can I PERMANENTLY turn ON vsync in my system (since turning vsync through console in games does not work).

I kindly ask to help me out as a newbie ...in simple steps if possible

Thank you in advance