var howMany = 4
var quote = new Array(howMany+1)

quote[0]="<a href='http://www.pokedome.co.cc'><img src='/Images/Ads/pokedomead.png' border='0' /></a>" 
quote[1]="<a href='http://www.tperpg.net'><img src='/Images/Ads/tperpgad.png' border='0' /></a>" 
quote[2]="<a href='http://pikachuregion.co.cc'><img src='/Images/Ads/PRAD.png' border='0' /></a>" 
quote[3]="<a href='http://www.000webhost.com/120765.html'><img src='/Images/Ads/0000webhost.gif' border='0' /></a>" 
quote[4]="<a href='http://secure.hostgator.com/cgi-bin/affiliates/clickthru.cgi?id=ANNG12'><img src='/Images/Ads/hostgator.gif' border='0' /></a>" 

function rndnumber(){
var randscript = -1
while (randscript < 0 || randscript > howMany || isNaN(randscript)){
randscript = parseInt(Math.random()*(howMany+1))
}
return randscript
}
quo = rndnumber()
quox = quote[quo]
document.write(quox)