var ligams = {};

var Carrousel_Settings = {
	radiusX : 220,
	radiusY : 50,
	centerX : 260,
	centerY : 70,
	minScale : 0.20,
	speed : 0.02,
	perspective : 20,
	thumbWidth : 314,
	thumbHeight : 209,
	interval : 50
};

ligams.carrousel = function(idElem){
	this.el = document.getElementById(idElem);
	this.items = this.getItems();
	this.itemWidth = this.items[0].style.width;
	this.itemHeight = this.items[0].style.height;
	this.angles = new Array();
	this.images = new Array();
	this.timer;
	this.timerName = "moving";
	this.initItems();
}

ligams.carrousel.prototype ={
    initItems:function(){
		var angles = new Array();
       	for(var i=0;i<this.items.length;i++){
			var item = this.items[i];
			var angle = i * ((Math.PI * 2) / this.items.length);
			this.angles.push(angle);
			var left = Math.cos(angle) * Carrousel_Settings.radiusX + Carrousel_Settings.centerX;
			var top = Math.sin(angle) * Carrousel_Settings.radiusY + Carrousel_Settings.centerY;
			item.style.marginLeft = left+'px';
			item.style.top = top+'px';
			
			var scale = (top - Carrousel_Settings.perspective) / (Carrousel_Settings.centerY + Carrousel_Settings.radiusY - Carrousel_Settings.perspective);
			
			var img = item.getElementsByTagName('img')[0];
			img.style.width = (Carrousel_Settings.thumbWidth*scale)+'px';
			img.style.height = (Carrousel_Settings.thumbHeight*scale)+'px';
			this.images.push(img);
		}
		this.launch();
	},
	getItems : function(){
		var t = new Array();
		var nodes = this.el.childNodes;
		for(var i=0;i<nodes.length;i++){
			if(nodes[i].nodeName && nodes[i].nodeName.toLowerCase()=='div' && nodes[i].className=='Carrousel_ligams_item')
				t.push(nodes[i])
		}
		return t;
	},
	moveItems : function(evt){
		if(evt==undefined || evt==null)
			evt = ligams.timer.instance.objects.moving.params;
		
		var str = ";";
		for(var i=0;i<evt.items.length;i++){
			var item = evt.items[i];
			evt.angles[i] = evt.angles[i] + Carrousel_Settings.speed;
			var angle = evt.angles[i];
			
			var left = Math.cos(angle) * Carrousel_Settings.radiusX + Carrousel_Settings.centerX;
			var top = Math.sin(angle) * Carrousel_Settings.radiusY + Carrousel_Settings.centerY;
			
			item.style.marginLeft = left+'px';
			item.style.top = top+'px';
			
			var scale1 = (top - Carrousel_Settings.perspective) / (Carrousel_Settings.centerY + Carrousel_Settings.radiusY - Carrousel_Settings.perspective);
			var scale = Math.max(scale1,Carrousel_Settings.minScale);
			
			var img = evt.images[i];
			var h = Math.round(Carrousel_Settings.thumbHeight*scale);
			img.style.width = Math.round(Carrousel_Settings.thumbWidth*scale)+'px';
			img.style.height = h+'px';
			
		      img.style["filter"] = "alpha(opacity="+scale*100+")";
			img.style["-moz-opacity"] = scale;
			img.style["-khtml-opacity"] = scale;
			img.style["opacity"] = scale;
    
			evt.items[i].style.zIndex = h*1000;
			str += h + ";";
		}		
	},
	launch : function(){
		this.timer = new ligams.timer();
		this.timer.setTimer(this.timerName,this.moveItems,Carrousel_Settings.interval,this,this);
	}
};
ligams.timer = function(){
	this.objects = new Object();
	ligams.timer.instance = this;		
}

ligams.timer.prototype = {
	setTimer : function(_name,_delegate,_duration,_object,_params){
		if(_params==null) this.params = new Array();
		else this.params = _params;
		this.objects[_name] = {};
		this.objects[_name].params = this.params;
		var id = setInterval(_delegate,_duration,_object);
		this.objects[_name].id = id;
	},
	killTimer : function(_name){
		clearInterval(this.objects[_name].id);
	}
}

function init(){
   new ligams.carrousel('ligams_carrousel');
}

function getElementsByClassName(className, tag, elm){
    var testClass = new RegExp("(^|s)" + className + "(s|$)");
    var tag = tag || "*";
    var elm = elm || document;
    var elements = (tag == "*" && elm.all) ? elm.all : elm.getElementsByTagName(tag);
    var returnElements = [];
    var current;
    var length = elements.length;
    for (var i = 0; i < length; i++) {
        current = elements[i];
        if (testClass.test(current.className)) {
            returnElements.push(current)
        }
    }
    return returnElements
}