var how_many_ads = 6;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
url="https://services.aamc.org/publications/index.cfm?fuseaction=Product.displayForm&prd_id=255";
alt="The Official Guide to the MCAT® Exam";
banner="/images/hp/ads/og-mcat.jpg";
width="150";
height="200";
}
if (ad==2) {
url="http://www.aspiringdocs.org";
alt="AspiringDocs.org - You can change the face of medicine";
banner="/images/hp/ads/aspiringdocs.jpg";
width="150";
height="200";
}
if (ad==3) {
url="http://www.aamc.org/workforce";
alt="We’re getting older. So are our doctors";
banner="/images/hp/ads/physwork.jpg";
width="150";
height="200";
}
if (ad==4) {
url="http://journals.lww.com/academicmedicine/toc/2009/12000";
alt="Academic Medicine, December 2009, Quality and Safety in Medicine";
banner="/images/hp/ads/ac-med-1209.jpg";
width="150";
height="200";
}
if (ad==5) {
url="https://services.aamc.org/publications/index.cfm?fuseaction=Product.displayForm&prd_id=296&prv_id=367";
alt="MSAR 2011-2012";
banner="/images/hp/ads/msar_hp.jpg";
width="150";
height="200";
}
if (ad==6) {
url="http://www.aamc.org/first";
alt="Medloans ® Calculator";
banner="/images/hp/ads/medloanscalc.jpg";
width="150";
height="200";
}

document.write('<a href=\"' + url + '\" target=\"_top\">');
document.write('<img src=\"' + banner + '\" width=')
document.write(width + ' height=' + height + ' ');
document.write('alt=\"' + alt + '\" border=0></a>');