var how_many_ads = 6;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;

ad +=1;

if (ad==1) {
var url="http://cgi.gammae.com/go.cgi?8526+gammacash";
var banner="banners/gamma1073.gif";
}

if (ad==2) {
var url="http://cgi.gammae.com/go.cgi?8526+gammacash";
var banner="banners/gamma1111.gif";
}

if (ad==3) {
var url="http://cgi.gammae.com/go.cgi?8526+gammacash";
var banner="banners/gamma681.gif";
}

if (ad==4) {
var url="http://cgi.gammae.com/go.cgi?8526+gammacash";
var banner="banners/gamma876.gif";
}

if (ad==5) {
var url="http://cgi.gammae.com/go.cgi?8526+gammacash";
var banner="banners/gamma879.gif";
}

if (ad==6) {
var url="http://www.join4free.com/affiliate.html?wm=24522";
var banner="banners/join4free1.jpg";
}

document.write('<center>');
document.write('<a href=\"' + url + '\" target=\"_blank\">');
document.write('<img src=\"' + banner + '\"')
document.write('border=0><br>');
document.write('</a>');
document.write('</center>');