window.addEventListener?window.addEventListener("load",so_init,false):window.attachEvent("onload",so_init);

var d=document, imgs = new Array(), zInterval = null, current=0, pause=false;

//sitelang es una variable que contiene el prefijo del idioma
function so_init() {
	if(!d.getElementById || !d.createElement)return;
		
	for(var i=1; i < 5; i++)
	{
		var img = d.createElement("img");
		img.id = "img_" + i;
		img.border = 0;
		img.className = "bannerImage";
		img.src = "resources/banners/nirvana/" + i + "_"+ sitelang +".jpg";
		img.style.display = "none";
		img.xOpacity = 0;
		
		imgs[i-1] = img;
		d.getElementById("bannerImageContainer").appendChild(img);
	
	}
	
	imgs[0].style.display = "block";
	imgs[0].xOpacity = .99;
	setTimeout(so_xfade,3000);
}

function so_xfade() {
	cOpacity = imgs[current].xOpacity;
	nIndex = imgs[current+1]?current+1:0;

	nOpacity = imgs[nIndex].xOpacity;
	
	cOpacity-=.05; 
	nOpacity+=.05;
	
	imgs[nIndex].style.display = "block";
	imgs[current].xOpacity = cOpacity;
	imgs[nIndex].xOpacity = nOpacity;
	
	setOpacity(imgs[current]); 
	setOpacity(imgs[nIndex]);
	
	if(cOpacity<=0) {
		imgs[current].style.display = "none";
		current = nIndex;
		setTimeout(so_xfade,3000);
	} else {
		setTimeout(so_xfade,50);
	}
	
	function setOpacity(obj) {
		if(obj.xOpacity>.99) {
			obj.xOpacity = .99;
			return;
		}
		obj.style.opacity = obj.xOpacity;
		obj.style.MozOpacity = obj.xOpacity;
		obj.style.filter = "alpha(opacity=" + (obj.xOpacity*100) + ")";
	}
	
}