var how_many_ads = 2; 
var now = new Date() 
var sec = now.getSeconds() 
var ad = sec % how_many_ads; ad +=1;


if (ad==1) 
{ 
url="http://www.gmat-success.com"; 
alt="Your GMAT Pass Key";
banner="http://www.litesee.com/images/banner4.gif"; 
width="250"; 
height="70"; 
}


if (ad==2) 
{ 
url="http://www.gmat-success.com/gmat-product.html" ; 
alt="GMAT Quantitative Software";
banner="http://www.litesee.com/images/banner3.gif"; 
width="250"; 
height="70"; 
}



document.write('<center>');
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>'); 
document.write('</center>');