var how_many_ads = 3;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
txt="Get Informed. Get the FREE Psychwatch Newsletter"; 
url="http://psychwatch.com/newsletter.htm";
alt="Get Informed. Get the FREE Psychwatch Newsletter";
banner="images/psychwatch-ad.gif";
width="440";
height="56";
}
if (ad==2) {
txt="Get Informed. Get the FREE Psychwatch Newsletter"; 
url="http://psychwatch.com/newsletter.htm";
alt="Get Informed. Get the FREE Psychwatch Newsletter";
banner="images/psychwatch-ad.gif";
width="440";
height="56";
}
if (ad==3) {
txt="Get Informed. Get the FREE Psychwatch Newsletter"; 
url="http://psychwatch.com/newsletter.htm";
alt="Get Informed. Get the FREE Psychwatch Newsletter";
banner="images/psychwatch-ad.gif";
width="440";
height="56";
}
document.write('<center>');
document.write('<a href=\"' + url + '\" target=\"_top\">');
document.write('<img src=\"' + banner + '\" width=')
document.write(width + ' height=' + height + ' ');
document.write('alt=\"' + alt + '\" border=0><br>');
document.write('<small>' + txt + '</small></a>');
document.write('</center>');