var how_many_ads = 4; 
var now = new Date()
var sec = now.getSeconds() 
var ad = sec % how_many_ads; 
ad +=1; 
if (ad==1) { 
url="http://www.BlueHost.Com/track/gkulm1775"; 
alt="BlueHost Web Hosting"; 
banner="http://img.bluehost.com/468x60/bh_468x60_04.gif"; 
width="468"; 
height="60"; 
} 
if (ad==2) { 
url="http://www.HostMonster.Com/track/haozqi"; 
alt="HostMonster Web Hosting"; 
banner="http://img.hostmonster.com/468x60/hm_468x60_04.gif"; 
width="468"; 
height="60";
} 
if (ad==3) { 
url="http://hosting.fastdomain.com/track/cxcat1231"; 
alt="FastDomain Web Hosting"; 
banner="http://img.fastdomain.com/468x60/fd_468x60_04.gif"; 
width="468"; 
height="60"; 
}
if (ad==4) { 
url="http://www.justhost.com/track/jh14300"; 
alt="JustHost Web Hosting"; 
banner="http://img.justhost.com/468x60/jh_468x60_us_01.gif"; 
width="468"; 
height="60"; 
}
document.write('<a href="' + url + '" target="_blank">'); 
document.write('<img src="' + banner + '" width=') ;
document.write(width + ' height=' + height + ' '); 
document.write('alt="' + alt + '" border=0><\/a><br>');