Effect.Transitions.squareroot = function(pos) {
	return Math.sqrt(pos);
};

Effect.Transitions.square = function(pos) {
	return Math.pow(pos, 2);
};

Effect.Transitions.fifth = function(pos) {
	return Math.sqrt((-Math.cos((pos)*Math.PI)/2) + 0.5);
};

Effect.Transitions.circle = function(pos) {
	return Math.sqrt(1 - Math.pow((pos-1), 2));
};