var content_display = 1;

var scroll = new Fx.Scroll('scroll_wrapper', {
	wait: false,
	duration: 3500,
	offset: {'x': -40, 'y': -50},
	transition: Fx.Transitions.Quad.easeInOut
});
 
$('link1').addEvent('click', function(event) {
	event = new Event(event).stop();
	if(content_display == 1)
	{
		content_display = 4;
	}
	else
	{
		content_display = content_display - 1;
	}
	scroll.toElement('content_'+content_display);
});
 
$('link2').addEvent('click', function(event) {
	event = new Event(event).stop();

	if(content_display == 4)
	{
		content_display = 1;
	}
	else
	{
		content_display = content_display + 1;
	}

	scroll.toElement('content_'+content_display);
});