var how_many_ads = 4;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
txt="CAMS .:. It's What's Happening.";
url="Cams.php";
alt="CAMS .:. It's What's Happening.";
banner="Images/IndexFeature1Cams.jpg";
width="450";
height="175";
}
if (ad==2) {
txt="WEATHER .:. Because It Happens.";
url="Weather.php";
alt="WEATHER .:. Because It Happens.";
banner="Images/IndexFeature2Weather.jpg";
width="450";
height="175";
}
if (ad==3) {
txt="RESOURCES .:. Because You Use Them."; 
url="Resources.php";
alt="RESOURCES .:. Because You Use Them.";
banner="Images/IndexFeature3Resources.jpg";
width="450";
height="175";
}
if (ad==4) {
txt="COMMUNITY .:. Get Talking!"; 
url="http://www.rivercams.com/Community";
alt="COMMUNITY .:. Get Talking!";
banner="Images/IndexFeature4Community.jpg";
width="450";
height="175";
}

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