chess against the computer

Jul 27, 2009, 9:11 PM |

September 20, 2009

I use mozilla firefox to play chess online but when I tried to play chess against the computer, the pieces wouldn't move. When I first started with I always played against the computer to improve my chess game. The time came when upgraded the website and now the pieces on my computer won't move. Can anyone help me with this problems? The JAVA chess board comes up and I am able to  reset the  chess board but the pieces won't move. What must I do to  get the chess pieces to move?