var aktiv;
var i = 0;

document.observe("dom:loaded", function() {
	
	$('up').observe('click', function(event) {
		
		if(i > 0) {
			new Effect.Move($('c3'),{x: 0, y: 50, duration: 0.8, mode:'relative', queue:'end'})
			Event.stop(event);
			i--;
		}
	});
	
	$('down').observe('click', function(event) {
		
		if(i <= 20) {
			new Effect.Move($('c3'),{x: 0, y: -50, duration: 0.8, mode:'relative', queue:'end'})
			Event.stop(event);
			i++;
		}
	});

});