window.addEvent('domready', function() {
									 
	// sliding images
	
	$('button_right').current_pos = 1;
	
	$('button_right').addEvent('click', function(e) {
		new Event(e).stop();
		
		if($('button_right').current_pos == 1){
			$('image_slider').set('tween', {duration: 300}).tween('margin-left','-320');
			$('button_right').current_pos = 2;
			return;
		}
		
		if($('button_right').current_pos == 2){
			$('image_slider').set('tween', {duration: 300}).tween('margin-left','-640');
			$('button_right').current_pos = 3;
			return;
		}
		
		if($('button_right').current_pos == 3){
			$('image_slider').set('tween', {duration: 300}).tween('margin-left','0');
			$('button_right').current_pos = 1;
			return;
		}
		
	});	
	
	
	
	
	
	
});