/*
---------------------------------------------
-     This JS code was last modified by     -
-     Gianluigi Cosari on March    2009     -
-          E-mail: glcosari@isys.it         -
-     Subject : Carousel per sito Lester    -
---------------------------------------------
*/

window.addEvent('domready', function() { 

	// Let's define some variables first
	var wrapper = $('carousel_wrap'); // The outer wrapper
	var carousel = $('carousel'); // The inner wrapper
	var items = $$('#carousel li'); // The different elements, this is an array
	var item_width = 220; // The full width of a single item (incl. borders, padding, etc ... if there is any)
	var max_margin = items.length * item_width - item_width;
	
	// Set up the animation
	var animation = new Fx.Tween(carousel, {duration: 500});
	
	// The function to browse forward
	function next_item(pos){
		if(pos == -max_margin){
			animation.start('left', 0);
		} else { 
			var newposition = pos - item_width;
			animation.start('left', newposition);
		}
	}
	
	// The function to browse backward
	function previous_item(pos){
		if(pos == 0){
			animation.start('left', -max_margin);
		} else { 
			var newposition = pos + item_width;
			animation.start('left', newposition);
		}
	}
	
	// Set up the 'next' and 'previous' buttons
	$('carousel_next').addEvent('click', function(){
		var position = parseInt(carousel.getStyle('left'));
		next_item(position);
	});
	
	$('carousel_previous').addEvent('click', function(){
		var position = parseInt(carousel.getStyle('left'));
		previous_item(position);
	});
	
});