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 + "' border=0 alt='" + alt + "' /></a>");
}

banner.prototype.dispBanner = dispBanner;
banners = new Array();

banners[0] = new banner("http://uptight.s187.xrea.com/bdsmf_img/rori5-1.gif","http://bdsm-finder.net/weblink/adclick.cgi?id=bdsmfplay1369_fc2 target='_blank'","灼熱ロウソクと鬼畜ファック！",1);
banners[1] = new banner("http://uptight.s187.xrea.com/bdsmf_img/rori5-2.gif","http://bdsm-finder.net/weblink/adclick.cgi?id=bdsmfplay1369_fc2 target='_blank'","灼熱ロウソクと鬼畜ファック！",1);
banners[2] = new banner("http://uptight.s187.xrea.com/bdsmf_img/rori5-3.gif","http://bdsm-finder.net/weblink/adclick.cgi?id=bdsmfplay1369_fc2 target='_blank'","灼熱ロウソクと鬼畜ファック！",1);
banners[3] = new banner("http://uptight.s187.xrea.com/bdsmf_img/rori5-4.gif","http://bdsm-finder.net/weblink/adclick.cgi?id=bdsmfplay1369_fc2 target='_blank'","灼熱ロウソクと鬼畜ファック！",1);
banners[4] = new banner("http://uptight.s187.xrea.com/bdsmf_img/rori5-5.gif","http://bdsm-finder.net/weblink/adclick.cgi?id=bdsmfplay1369_fc2 target='_blank'","灼熱ロウソクと鬼畜ファック！",1);
banners[5] = new banner("http://uptight.s187.xrea.com/bdsmf_img/rori5-6.gif","http://bdsm-finder.net/weblink/adclick.cgi?id=bdsmfplay1369_fc2 target='_blank'","灼熱ロウソクと鬼畜ファック！",1);

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 + "' border=0 alt='" + banners[i].alt + "' /></a>");
return banners[i];
break;
      }
   }
}