Effect.Transitions.exponential = function(pos) {
  return 1-Math.pow(1-pos,2);
}
var num_winners;
var cur_winner = 1;
function winnersright() {
	if(cur_winner < num_winners) {
		new Effect.MoveBy('winners_inner', 0, -295 , 
			{
			  duration: 0.4,  
			  transition: Effect.Transitions.exponential
			});
		cur_winner++;
	}
}

function winnersleft() {
	if(cur_winner > 1) {
		new Effect.MoveBy('winners_inner', 0, 295 ,
			{
				duration: 0.4,
				transition: Effect.Transitions.exponential
			});
		cur_winner--;
	}
}