def METHOD_NAME(prev=False,startMode=None):
	"""
	Sets the current review mode to the next available  mode and updates the review position. 
	@param prev: if true then switch to the previous mode. If false, switch to the next mode.
	@type prev: bool
	@return: a presentable label for the new current mode (suitable for speaking or brailleing)
	@rtype: string
	"""
	if startMode is None:
		startMode=_currentMode
	newMode=startMode+(1 if not prev else -1)
	if newMode<0 or newMode>=len(modes):
		return None
	label=setCurrentMode(newMode)
	return label or METHOD_NAME(prev=prev,startMode=newMode)