Call the registrar's office of the school you went to - for a fee, they will send you a new diploma.

I got married still in university, and received my diploma with my married name on it. When I was divorced, it was important to me to have that changed to my maiden name (since I did 3.5 years of my degree before getting married). I called the registrar, and they re-issued my diploma (This was Univ of Waterloo).

Good luck!

SheFly