var how_many_ads = 7;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
txt="One Stop Shop for Books at Amazon.com";
url="http://www.amazon.com/exec/obidos/redirect-home/homepageimprovem";
alt="Amazon.com";
banner="graphics/banners/bkrf468.gif";
width="468";
height="60";
}
if (ad==2) {
txt="Buy Books at Amazon.com";
url="http://www.amazon.com/exec/obidos/redirect-home/homepageimprovem";
alt="Amazon.com";
banner="graphics/banners/book_metal_468_anim.gif";
width="468";
height="60";
}
if (ad==3) {
txt="Buy Books at Amazon.com"; 
url="http://www.amazon.com/exec/obidos/redirect-home/homepageimprovem";
alt="Amazon.com";
banner="graphics/banners/bktst468x60.gif";
width="468";
height="60";
}
if (ad==4) {
txt="Search for Books at Amazon.com"; 
url="http://www.amazon.com/exec/obidos/redirect-home/homepageimprovem";
alt="Amazon.com";
banner="graphics/banners/bksc468.gif";
width="468";
height="60";
}
if (ad==5) {
txt="Find Any Title in Seconds at Amazon.com"; 
url="http://www.amazon.com/exec/obidos/redirect-home/homepageimprovem";
alt="Amazon.com";
banner="graphics/banners/clock468x60a3.gif";
width="468";
height="60";
}
if (ad==6) {
txt="Books at Amazon.com"; 
url="http://www.amazon.com/exec/obidos/redirect-home/homepageimprovem";
alt="Amazon.com";
banner="graphics/banners/shopbooks_add_468x60_anim.gif";
width="468";
height="60";
}
if (ad==7) {
txt="Shop Here for Books at Amazon.com"; 
url="http://www.amazon.com/exec/obidos/redirect-home/homepageimprovem";
alt="Amazon.com";
banner="graphics/banners/shopbooks_orange_468x60_anim.gif";
width="468";
height="60";
}
document.write('<div align=\"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('<span style=\"font-family:Arial,Helvetica,sans-serif; font-size:9pt\">' + txt + '</span></a>');
document.write('</div>');