var how_many_ads = 1;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
url="http://www.thestreetsnetwork.com/add-link/";
banner="http://www.streetsofbrisbane.com.au/images/interface/top-right-120x60.gif";
where="_self";
}

document.write('<a href=\"' + url + '\" target=\"' + where + '\"><img src=\"' + banner + '\" border=0 vspace=0 height=60 width=120></a>');