I'm leaving this here for the sake of posterity, but I wouldn't use it if I were you. It's not very flexible and not responsive at all. If I were going to use a pre-made grid these days, I'd be looking at Bootstrap's grid. It's pretty darned good.
A flexible grid system written in LESS. Adjusting the 3 variables at the top of the file will produce any grid imaginable.
For more, go to the official LESS website: http://lesscss.org