var maxImages=new Number(12);
var img_array=new Array();
var delai=2000; 
var img_actu=new Number(0);
function initAnim(){
	for(var i=0; i<maxImages; i++){
		img_array[i]=new Image();
		img_array[i].onLoad = function(){
			alert('charge ok');
		}
		img_array[i].src = 'img/anim/'+i+'.png';
	}
	this.intervalId=setInterval(function(){changeImage();}, delai);
}
function changeImage(){
	img_actu = img_actu<maxImages ? img_actu+1 : 0;
	document.getElementById('anim').src = img_array[img_actu].src;
}