/**
 * Image src URLs
 **/
var imageList = [
				 "urunler/pudra_ananas.jpg",
				 "urunler/pudra_ananas.jpg",
     		 	 "urunler/pudra_cappucino.jpg",
				 "urunler/pudra_cilek.jpg",
				 "urunler/pudra_damlaSakizi.jpg",
				 "urunler/pudra_elma.jpg",
				 "urunler/pudra_findik.jpg",
				 "urunler/pudra_hindistan.jpg",
				 "urunler/pudra_karamel.jpg",
				 "urunler/pudra_kavun.jpg",
				 "urunler/pudra_kayisi.jpg",
				 "urunler/pudra_limon.jpg",
				 "urunler/pudra_muz.jpg",
				 "urunler/pudra_portakal.jpg",
				 "urunler/pudra_sade.jpg",
				 "urunler/pudra_seftali.jpg",
				 "urunler/pudra_visne.jpg",
				];
var urlList = [
				 "u_PudraSekeri.php?urunID=33",
				 "u_PudraSekeri.php?urunID=33",
				 "u_PudraSekeri.php?urunID=34",
				 "u_PudraSekeri.php?urunID=35",
				 "u_PudraSekeri.php?urunID=36",
				 "u_PudraSekeri.php?urunID=37",
				 "u_PudraSekeri.php?urunID=38",
				 "u_PudraSekeri.php?urunID=39",
				 "u_PudraSekeri.php?urunID=40",
				 "u_PudraSekeri.php?urunID=41",
				 "u_PudraSekeri.php?urunID=42",
				 "u_PudraSekeri.php?urunID=43",
				 "u_PudraSekeri.php?urunID=44",
				 "u_PudraSekeri.php?urunID=45",
				 "u_PudraSekeri.php?urunID=46",
				 "u_PudraSekeri.php?urunID=47",
				 "u_PudraSekeri.php?urunID=48",
				 				 ];
var textList = [
				 "Ananas Aromalı Pudra Şekeri",
				 "Ananas Aromalı Pudra Şekeri",
				 "Cappucino Aromalı Pudra Şekeri",
				 "Çilek Aromalı Pudra Şekeri",
				 "D.Sakızı Aromalı Pudra Şekeri",
				 "Elma Aromal&#305;<br> Pudra &#350;ekeri",
				 "F&#305;nd&#305;k Aromal&#305; Pudra &#350;ekeri",
				 "H.Cevizi Aromal&#305; Pudra &#350;ekeri",
				 "Karamel Aromal&#305; Pudra &#350;ekeri",
				 "Kavun Aromal&#305; Pudra &#350;ekeri",
				 "Kay&#305;s&#305; Aromal&#305; Pudra &#350;ekeri",
				 "Limon Aromal&#305; Pudra &#350;ekeri",
				 "Muz Aromal&#305; <br> Pudra &#350;ekeri",
				 "Portakal Aromal&#305; Pudra &#350;ekeri",
				 "Sade Pudra <br> &#350;ekeri",
				 "&#350;eftali Aromal&#305; Pudra &#350;ekeri",
				 "Vi&#351;ne Aromal&#305;<br> Pudra &#350;ekeri",
				 ];
var lastRan = -1;

/**
 * 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 + 
  		'" class="genelYaziTipiKucuk"><img src="' + 
  		imgUrl +
		'" width="' +
		55 +
		'" height="' +
		81+
		'"/>' + 
  		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 randomIndex = getRandom(48, lastRan);
		//lastRan = randomIndex;
		carousel.addItem(i, fmtItem(imageList[i], urlList[i], textList[i]));
		//Example of an alternate way to add an item (passing an element instead of html string)
		//var p = document.createElement("P");
		//var t = document.createTextNode("Item"+i);
		//p.appendChild(t);
		//carousel.addItem(i, p );
	}
};

var getRandom = function(max, last) {
	var randomIndex;
	do {
		randomIndex = Math.floor(Math.random()*max);
	} while(randomIndex == last);
	
	return randomIndex;
};

/**
 * 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 = "images/left-enabled.gif";	
	} else {
		leftImage.src = "images/left-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:        5,
			animationSpeed:    1.00,
			scrollInc:         4,
			navMargin:         20,
			prevElement:       "prev-arrow",
			nextElement:       "next-arrow",
			loadInitHandler:   loadInitialItems,
			loadNextHandler:   loadNextItems,
			loadPrevHandler:   loadPrevItems,
			prevButtonStateHandler:   handlePrevButtonState,
			
			autoPlay: 4000,
			size:16,
			wrap:true
		}
	);
};

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