Mirror Skin Weights option
 

Hey all,
I'm following a tutorial on rigging and painting weights and when I get to the part of mirroring weights, there's an option in the video that I dont have. In the video, when the Mirror Skin Weights Option box is selected, an option to change "Influence Association 1" and "Influence Association 2" is there. I however do not have the option. I am using Maya 8 and the Digital Tutors might be using 2008. Is there the same option in 8? Thanks so much.

BTW, the tutorial is Rigging Quadrupeds.

Thanks, Eric