18. The computer readable medium of claim 13 , the computer program further comprising a set of instructions for receiving input to define an effect script, wherein the set of instructions for receiving the selection of the effect comprises a set of instructions for receiving a selection of the defined effect script to apply to the first and second characters.
18. The computer readable medium of claim 13 , the computer program further comprising a set of instructions for receiving input to define an effect script, wherein the set of instructions for receiving the selection of the effect comprises a set of instructions for receiving a selection of the defined effect script to apply to the first and second characters. 19. The computer readable medium of claim 18 , wherein the selected effect script specifies a set of parameters and a value for each parameter.