<!-- Begin
var how_many_ads = 5;  // numero de imagens
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;

if (ad==1) {
banner="<img src=images/tentativa1.jpg width=400 height=150>";
}
if (ad==2) {
banner="<img src=images/tentativa2.jpg width=400 height=150>";
}
if (ad==3) {
banner="<img src=images/tentativa3.jpg width=400 height=150>";
}
if (ad==4) {
banner="<img src=images/tentativa4.jpg width=400 height=150>";
}
if (ad==5) {
banner="<img src=images/tentativa5.jpg width=400 height=150>";
}

document.write("" + banner + "");
// End -->