How do I get this civil judgement off of my credit?

A car accident occured with my ex mother in law in 02. We were all on the same policy, so it went through our state farm insurace. I was divorced in 1/05 (out of the house in 2/04). Just saw a civil judgement on my credit report. My divorce lawyer says she needs a 2000 retainer fee to go at my ex because she never mentioned this judgement at the time of divorce (which she was supposed to). How can I get this off of my credit report without having to pay the 2000? Also, if my ex has not paid this judgement (filed in 4/05), how can I expect to get my retainer fee back from my lawyer (said we'd go after the ex for lawyer fees as well as credit report correction fees)..Please help, I am looking for a house and this looks bad on the credit!