var how_many_ads = 3;

var now = new Date()

var sec = now.getSeconds()

var ad = sec % how_many_ads;

ad +=1;

if (ad==1) {

url="../series/ult10.htm";

alt="Ultimate 10...";

banner="../resources/images/ult10.jpg";

width="100";

height="67";

}

if (ad==2) {

url="../series/dhbc.htm";

alt="Discovery Health Body Challenge";

banner="../resources/images/bchal.jpg";

width="100";

height="67";

}

if (ad==3) {

url="../series/tz.htm";

alt="Total Zoo";

banner="../resources/images/keepers.gif";

width="100";

height="67";

}

document.write('<center>');

document.write('<a href=\"' + url + '\" target=\"_parent\">');

document.write('<img src=\"' + banner + '\" width=')

document.write(width + ' height=' + height + ' ');

document.write('alt=\"' + alt + '\" border=0><br></a>');

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