var banners = new Array(1); 

banners[0] = "bannerInvierno"; 

var i_banner = 0;



function rotarBanner()

{

 document.getElementById(banners[i_banner]).style.display = 'none';

 i_banner ++;

 i_banner = i_banner % banners.length;

 document.getElementById(banners[i_banner]).style.display = 'block';

 setTimeout("rotarBanner()",5000);

}