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.russiaenergy.com/"; 
alt="banEnergyFinal";  
banner="/images/banEnergyFinal.gif"; 
width="610"; 
height="60"; 
} 

if (ad==2) {   
url="http://www.russianavia.net/"; 
alt="bannRUSSIAN AVIA final";  
banner="/images/bannRUSSIAN-AVIA-final.gif";  
width="610"; 
height="60"; 
} 
  
if (ad==3) { 
url="http://www.europeavia.com/"; 
alt="EuropeAvia Bann Finale"; 
banner="/images/EuropeAvia-Bann-Finale.gif"; 
width="610"; 
height="60"; 
}

if (ad==4) { 
url="http://www.greentechfocus.com/"; 
alt="GreenTechBANend"; 
banner="/images/GreenTechBANend.gif"; 
width="610"; 
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><br>');