function banner(img_source,url,alt,chance,width,height)
{
   this.img_source = img_source;
   this.url = url;
   this.alt = alt;
   this.chance = chance;
   this.width = width;
   this.height = height;
}

function display() {
   with (this) document.write("<A HREF=" + url + "><IMG SRC='" + img_source + "' WIDTH=468 HEIGHT=60 BORDER=0 ALT='" + alt + "'></A>");
}

banner.prototype.display = display;
banners = new Array();
banners[0] = new banner("baner/europa.gif",
                        "http://www.europa-universalis.sztab.com target='_blank'",
                        "Europa Universalis [SVV]",
                        10,460,60);
banners[1] = new banner("baner/cossacks.gif",
                        "http://www.cossacks.sztab.com target='_blank'",
                        "Cossacks [SVV]",
                        10,468,60);
banners[2] = new banner("baner/sztab.gif",
                        "http://www.sztab.com target='_blank'",
                        "Sztab VVeteranów",
                        10,468,60);
banners[3] = new banner("baner/total.gif",
                        "http://www.totalwar.pl target='_blank'",
                        "Strona gier z serii Total War",
                        10,468,68);
banners[4] = new banner("baner/knights.gif",
                        "http://www.knights.sztab.com target='_blank'",
                        "Knights and Merchants",
                        10,468,60);
banners[5] = new banner("baner/mastero.gif",
                        "http://www.master-of-orion.sztab.com target='_blank'",
                        "Master of Orion",
                        10,468,60);
banners[6] = new banner("baner/rtsarea.gif",
                        "http://www.rtsarea.sztab.com target='_blank'",
                        "RTS Area Online",
                        10,468,60);
sum_of_all_chances = 0;
for (i = 0; i < banners.length; i++) {
   sum_of_all_chances += banners[i].chance;
}
function display_banner() {
   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].img_source + "' WIDTH='" + banners[i].width + "' HEIGHT='" + banners[i].height + "' BORDER=0 ALT='" + banners[i].alt + "'></A>");
         return banners[i];
         break;
      }
   }
}