text: /**
   * Enum for key codes.
   * @enum {number}
   */
  var keyCodes={
  	BACKSPACE: 8,
  	COMMA: 188,
  	DELETE: 46,
  	ENTER: 13,
  	ESCAPE: 27,
  	NUMPAD_ADD: 107,
  	NUMPAD_DECIMAL: 110,
  	NUMPAD_DIVIDE: 111,
  	NUMPAD_ENTER: 108,
  	NUMPAD_MULTIPLY: 106,
  	NUMPAD_SUBTRACT: 109,
  	PERIOD: 190,
  	SPACE: 32,
  	TAB: 9,
  	
  	
  	SHIFT:16,
  	CTRL:17,
  	ALT:18,
  	PAUSE_BREAK:19,
  	CAPS_LOCK:20,
  	
  	PAGE_UP: 33,
  	PAGE_DOWN: 34,
  	END: 35,
  	HOME: 36,
  	LEFT: 37,
  	UP: 38,
  	RIGHT: 39,
  	DOWN: 40
  };