function Banner(url, description, image) {
		this.url = url;
		this.description = description;
		this.image = image;
}
var banners = new Array();	
banners[0] = new Banner("/postekey/index.shtml", "vai a PosteKey", "/images/body/bannerHomesxPostekey.gif");
banners[1] = new Banner("/pec/privatiofferta.shtml", "vai alla Posta Elettronica Certificata", "/images/body/bannerHomesxPEC.jpg");					
var divBanner = null;
var curr_banner = 0;
function mostra_banner()
{
  divBanner = (document.layers ? document.layers['banner'] : document.getElementById('banner'));
  window.setInterval("rotazione_banner()", 5000);
  rotazione_banner();
}
function rotazione_banner() {
  divBanner.innerHTML = "<a href='" + banners[curr_banner].url + "' title='" + banners[curr_banner].description + "'><img src='" + banners[curr_banner].image + "' alt='" + banners[curr_banner].description + "'></a>";
	curr_banner++;
	if (curr_banner >= banners.length)
		curr_banner = 0;
}