Here is a link to the exercises:
http://www.youtube.com/watch?v=A2QQaVfeI4U
I have found this exercise to be helpful to me, it might help you!
(you might want to check with your doctor or physio first)
If you want more information on "what is Tennis Elbow" with symptoms and diagrams:
http://chirocentre.co.uk/tennis-elbow-treatment/
Hope this helps!