var how_many_ads = 5;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;

if (ad==1) {
url="#";
alt="Custom Flexible Packaging";
banner="http://www.rfplastics.com/banner/top1.jpg";
}

if (ad==2) {
url="#";
alt="Custom Flexible Packaging";
banner="http://www.rfplastics.com/banner/top2.jpg";
}

if (ad==3) {
url="#";
alt="Custom Flexible Packaging";
banner="http://www.rfplastics.com/banner/top3.jpg";
}

if (ad==4) {
url="#";
alt="Custom Flexible Packaging";
banner="http://www.rfplastics.com/banner/top4.jpg";
}

if (ad==5) {
url="#";
alt="Custom Flexible Packaging";
banner="http://www.rfplastics.com/banner/top5.jpg";
}

document.write('<a href=\"' + url + '\" target=\"_blank\">');
document.write('<img src=\"' + banner + '\" width=778 height=80 ')
document.write('alt=\"' + alt + '\" border=0></a>');