var how_many_ads = 12;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;

if (ad==1) {
txt="";
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/duc_999USA.jpg";
width="779";
height="98";
}
if (ad==2) {
txt="";
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/duc_1098b.jpg";
width="779";
height="98";
}
if (ad==3) {
txt=""; 
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/ggbridge_01.jpg";
width="779";
height="98";
}
if (ad==4) {
txt=""; 
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/husq_sm01.jpg";
width="779";
height="98";
}
if (ad==5) {
txt=""; 
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/husq_te.jpg";
width="779";
height="98";
}
if (ad==6) {
txt=""; 
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/duc_sport02.jpg";
width="779";
height="98";
}
if (ad==7) {
txt=""; 
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/mtg_breva.jpg";
width="779";
height="98";
}
if (ad==8) {
txt=""; 
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/mtg_norge.jpg";
width="779";
height="98";
}
if (ad==9) {
txt=""; 
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/mv_chuck02.jpg";
width="779";
height="98";
}
if (ad==10) {
txt=""; 
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/mv_tamburini.jpg";
width="779";
height="98";
}
if (ad==11) {
txt=""; 
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/tri_thruxton.jpg";
width="779";
height="98";
}
if (ad==12) {
txt=""; 
url="";
alt="Munroe Motors - San Francisco";
banner="http://www.munroemotors.com/images/banners/tri_rocket01.jpg";
width="779";
height="98";
}
document.write('<center>');
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('</right>');