var banners = new Array(3);
 
banners[0] = "nta"; 
banners[1] = "nta2"; 
banners[2] = "nta3"; 


 
function Ocultar(ids){
for(i=0;i<ids.length;i++){
id=ids[i];
document.getElementById(id).style.visibility="hidden";
}
}
 


b=0;

function cambiar(){

	Ocultar(banners);
	document.getElementById(banners[b]).style.visibility="visible";
		b++;
	if (b>2){
		b=0;
		}
}



var stop = setInterval("cambiar()",14000);