Javascript bowling simulator

Bowling javascript simulator, with the following features:

multi-lingual support
multi-player support
strike/spare simulator (knocks down all the pins that are standing)
normal throw simulator (knocks down a random number of pins)
animation for pin strikes -- simulates which pins are likely to be knocked down. For example, it's physically impossible to knock down the middle pin (index 4) without knocking down the front pin. The simulator includes sets of pin combinations a player is likely to see in real life (see pinPatterns in js/Renderer.js).
winner's screen, which lists the winner (or winners, if there is a tie match) and the point total
user is given option to play again, choose new players, or leave the game at the end of the match

This program contains the following javascript files:

js/lib.js -- extends core javascript classes with some useful functional methods
js/Bowl.js -- the main class for the bowling game
js/Frame.js -- class representing a frame
js/Player.js -- simple class representing a single player
js/Renderer.js -- renderer class which controls the DOM and animations

All javascript is native, no external libraries used.

biegel/bowling