I apologize for hijacking a meta.math thread here, but it was suggested to me that I ask this question on this forum. I'm involved with the theoretical computer science SE site (cstheory.stackexchange.com) and we would also like to enable mathJAX support for our site. We're reaching the point where it's difficult to read questions or write answers without effective math rendering (I'm using the John Gietzen greasemonkey script at the client side, but that doesn't work for everyone).
My question is: how did you go about enabling mathJAX support ? I'm asking so that we can follow the same procedure.