function banner(imgSource,url,alt,chance) {
this.imgSource = imgSource;
this.url = url;
this.alt = alt;
this.chance = chance;
}

// groesse des banners unbedingt 2 mal eintragen (auch weiter unten noch mal)

function dispBanner() {
with (this) document.write("<A HREF=" + url + "><IMG SRC='" + imgSource + "' WIDTH=697 HEIGHT=177 BORDER=0 ALT='" + alt + "'></A>");
}
banner.prototype.dispBanner = dispBanner;

banners = new Array();

banners[0] = new banner("img/random_banner/banner01.jpg","","", 100);
banners[1] = new banner("img/random_banner/banner02.jpg","","", 100);
banners[2] = new banner("img/random_banner/banner03.jpg","","", 100);
banners[3] = new banner("img/random_banner/banner04.jpg","","", 100);
banners[4] = new banner("img/random_banner/banner05.jpg","","", 100);
banners[5] = new banner("img/random_banner/banner06.jpg","","", 100);
banners[6] = new banner("img/random_banner/banner07.jpg","","", 100);
banners[7] = new banner("img/random_banner/banner08.jpg","","", 100);
banners[8] = new banner("img/random_banner/banner09.jpg","","", 100);
banners[9] = new banner("img/random_banner/banner10.jpg","","", 100);
banners[10] = new banner("img/random_banner/banner11.jpg","","", 100);
banners[11] = new banner("img/random_banner/banner12.jpg","","", 100);
banners[12] = new banner("img/random_banner/banner13.jpg","","", 100);
banners[13] = new banner("img/random_banner/banner24.jpg","","", 100);



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("<IMG SRC='" + banners[i].imgSource + "' WIDTH=697 HEIGHT=177 BORDER=0 ALT='"  + banners[i].alt + "'"); return banners[i];
return banners[i];
break;
}
}
}