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.accessmba.com/MBA_and_Masters/sofia.php" ; 
alt="Access MBA Tour in Sofia";
banner="http://testove.com/img/728x90_cut_MBA_Masters_Bulgaria.gif"; 
width="728"; 
height="90"; 
}

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>');