banners = []
banners[1]  = ["www.chatspecial.com","chatspecial/01.gif"]
banners[2]  = ["www.chatspecial.com","chatspecial/02.gif"]
banners[3]  = ["www.smsgreat.com","smsgreat/01.gif"]
banners[4]  = ["www.smsgreat.com","smsgreat/02.gif"]
banners[5]  = ["www.jojochat.com","jojochat/01.gif"]
banners[6]  = ["www.jojochat.com","jojochat/02.gif"]

totals = banners.length-2
rn = Math.round(Math.random()*totals)+1
document.write('<a href="http://'+banners[rn][0]+'" target="_blank"><img src="http://www.topupads.com/images/banners/'+banners[rn][1]+'" width="468" height="60" border="0"></a>');