var how_many_ads = 5; //this is how many ads you have
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;

if (ad==1) {
site="anjichan"
url="http://anjichan.livejournal.com/";
alt="livejournal";
banner="http://kuroi-hoshi.org/kuroi-hoshi/links/anjichan.png";
}
if (ad==2) {
site="Fanatic"
url="http://fanatic.kuroi-hoshi.org";
alt="Fanlistings Collective";
banner="http://kuroi-hoshi.org/kuroi-hoshi/links/fanatic.png";
}
if (ad==3) {
site="kuroi-tsuki.org"
url="http://kuroi-tsuki.org/";
alt="Blogging Domain";
banner="http://kuroi-hoshi.org/kuroi-hoshi/links/ktorg.png";
}
if (ad==4) {
site="Shozoku; the owned!"
url="http://shozoku.kuroi-hoshi.org/";
alt="web clique";
banner="http://kuroi-hoshi.org/kuroi-hoshi/links/theowned.png";
}
if (ad==5) {
site="The.J-Beat"
url="http://jpop.kuroi-tsuki.org/";
alt="anime & jmusic rotation";
banner="http://kuroi-hoshi.org/kuroi-hoshi/links/tjbeat.png";
}

document.write('<a href=\"' + url + '\" target=\"_blank\" title=\"' + site + ': ' + alt + '\">');
document.write('<img src=\"' + banner + '\" border=0 width=180 + height=246></a><br>')