var how_many_ads = 2;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
url="http://www.camchoice.com/autolinks/?i=pnwebcam";
}
if (ad==2) {
url="http://www.cams7.com/cgi-bin/top100/rankem.cgi?id=pnwebcam";
}

rotpop=window.open('','rotpop','toolbar=1,menubar=1,scrollbars=1,status=1,resizable=1,top=1,left=1,width=640,height=480'); 
rotpop.blur();
rotpop.location=url;