function banner(imgSource,url,alt,chance) {
this.imgSource = imgSource;
this.url = url;
this.alt = alt;
this.chance = chance;
}
function dispBanner() {
with (this) document.write("<A HREF=" + url + "><IMG SRC='" + imgSource + "' WIDTH=289 HEIGHT=81 BORDER=0 ALT='" + alt + "'></A>");
}
banner.prototype.dispBanner = dispBanner;
banners = new Array();

banners[0] = new banner("/banner/sstefano.gif",
                        "http://www.cortonaweb.net/fclick/fclick.php?fid=118 target='_blank'",
                        "Azienda Agricola Santo Stefano",
                        10);
						
banners[1] = new banner("/banner/valcella_gif.gif",
                        "http://www.cortonaweb.net/fclick/fclick.php?fid=119 target='_blank'",
                        "Casa Vacanze Valcella",
                        10);

banners[2] = new banner("/banner/belvedere.gif",
                        "http://www.cortonaweb.net/fclick/fclick.php?fid=121 target='_blank'",
                        "Agriturismo il Belvedere",
                        10);

banners[3] = new banner("/banner/santagnese.gif",
                        "http://www.cortonaweb.net/fclick/fclick.php?fid=120 target='_blank'",
                        "Villa Santa Agnese",
                        10);

banners[4] = new banner("/banner/spinabbio.gif",
                        "http://www.cortonaweb.net/fclick/fclick.php?fid=136 target='_blank'",
                        "Agriturismo Spinabbio",
                        10);

banners[5] = new banner("/banner/schiatti.gif",
                        "http://www.cortonaweb.net/fclick/fclick.php?fid=137 target='_blank'",
                        "Villa Schiatti",
                        10);

sum_of_all_chances = 0;
for (i = 0; i < banners.length; i++) {
sum_of_all_chances += banners[i].chance;
}
function randomBanner() {
chance_limit = 0;
randomly_selected_chance = Math.round((sum_of_all_chances - 1) * Math.random()) + 1;
for (i = 0; i < banners.length; i++) {
chance_limit += banners[i].chance;
if (randomly_selected_chance <= chance_limit) {
document.write("<A HREF=" + banners[i].url + "><IMG SRC='" + banners[i].imgSource + "' WIDTH=289 HEIGHT=81 BORDER=0 ALT='" + banners[i].alt + "'></A>");
return banners[i];
break;
      }
   }
}