/**
 * Image src URLs
 **/
var imageList = [
				 "imagens/scroll/thumbs/thumbs_11.png",	
				 "imagens/scroll/thumbs/thumbs_10.png",	
				 "imagens/scroll/thumbs/thumbs_09.png",
				 "imagens/scroll/thumbs/thumbs_08.png",
				 "imagens/scroll/thumbs/thumbs_07.png",
				 "imagens/scroll/thumbs/thumbs_06.png",
				 "imagens/scroll/thumbs/thumbs_05.png",
				 "imagens/scroll/thumbs/thumbs_04.png",
				 "imagens/scroll/thumbs/thumbs_03.png",
				 "imagens/scroll/thumbs/thumbs_02.png",
				 "imagens/scroll/thumbs/thumbs_01.png" 
				 
				 ];

var anosList = [	
				
				 "2009",
				 "2008",
				 "2007",
				 "2006",
				 "2005",
				 "2004",
				 "2003",
				 "2002",
				 "2001",
				 "2000",
				 "1999"
				
				 ];


/**
 * Since carousel.addItem uses an HTML string to create the interface
 * for each carousel item, this method formats the HTML for an LI.
 **/
var fmtItem = function(imgUrl, url, title) {

  	var innerHTML = 
  		'<a href="' + url + '"><img src="' + 
  		imgUrl +
		'" width="' +
		89 +
		'" height="' +
		121+
		'"/>' + 
  		title + 
  		'<\/a>';
  
	return innerHTML;
	
};

/**
 * Custom inital load handler. Called when the carousel loads the initial
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadInitHandler
 **/
var loadInitialItems = function(type, args) {
	var start = args[0];
	var last = args[1]; 

	load(this, start, last);	
};

/**
 * Custom load next handler. Called when the carousel loads the next
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadNextHandler
 **/
var loadNextItems = function(type, args) {	

	var start = args[0];
	var last = args[1]; 
	var alreadyCached = args[2];
	
	if(!alreadyCached) {
		load(this, start, last);
	}
};

/**
 * Custom load previous handler. Called when the carousel loads the previous
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadPrevHandler
 **/
var loadPrevItems = function(type, args) {
	var start = args[0];
	var last = args[1]; 
	var alreadyCached = args[2];
	
	if(!alreadyCached) {
		load(this, start, last);
	}
};

var load = function(carousel, start, last) {

	for(var i=start; i<=last; i++) {
		var img=i;
		img--;
		carousel.addItem(i, fmtItem(imageList[i-1], "retrospectiva.php",+ anosList[img]));
	}
};



/**
 * Custom button state handler for enabling/disabling button state. 
 * Called when the carousel has determined that the previous button
 * state should be changed.
 * Specified to the carousel as the configuration
 * parameter: prevButtonStateHandler
 **/
var handlePrevButtonState = function(type, args) {

	var enabling = args[0];
	var leftImage = args[1];
	if(enabling) {
		leftImage.src = "imagens/scroll/setas/left-disabled.gif";		
	} else {
		leftImage.src = "imagens/scroll/setas/left-disabled.gif";	
	}
	
};

/**
 * Custom button state handler for enabling/disabling button state. 
 * Called when the carousel has determined that the next button
 * state should be changed.
 * Specified to the carousel as the configuration
 * parameter: nextButtonStateHandler
 **/
var handleNextButtonState = function(type, args) {

	var enabling = args[0];
	var rightImage = args[1];
	if(enabling) {
		rightImage.src = "imagens/scroll/setas/right-disabled.gif";	
	} else {
		rightImage.src = "imagens/scroll/setas/right-disabled.gif";
	}
	
};

/**
 * You must create the carousel after the page is loaded since it is
 * dependent on an HTML element (in this case 'dhtml-carousel'.) See the
 * HTML code below.
 **/
var carousel; // for ease of debugging; globals generally not a good idea
var pageLoad = function() 
{
	carousel = new YAHOO.extension.Carousel("dhtml-carousel", 
		{
			numVisible:        4,
			animationSpeed:    0.4,
			animationMethod:   YAHOO.util.Easing.easeBoth,
			scrollInc:         3,
			navMargin:         40,
			size:              11, 	//Numero de Imagens
			loadInitHandler:   loadInitialItems,
			prevElement:     "prev-arrow",
			nextElement:     "next-arrow",
			loadNextHandler:   loadNextItems,
			loadPrevHandler:   loadPrevItems,
			prevButtonStateHandler:   handlePrevButtonState,
			nextButtonStateHandler:   handleNextButtonState
			
		}
	);
};

YAHOO.util.Event.addListener(window, 'load', pageLoad);