var how_many_ads =5;
var now = new Date();
var sec = now.getSeconds();
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
var msg1="<iframe src=http://www.asiacool.com/joke/j1.htm width=773 height=246 frameborder=no border=0 MARGINWIDTH=0 MARGINHEIGHT=0 SCROLLING=no></iframe>"
document.write(msg1)
}
if (ad==2) {
var msg1="<iframe src=http://www.asiacool.com/joke/j2.htm width=773 height=246 frameborder=no border=0 MARGINWIDTH=0 MARGINHEIGHT=0 SCROLLING=no></iframe>"
document.write(msg1)
}
if (ad==3) {
var msg1="<iframe src=http://www.asiacool.com/joke/j3.htm width=773 height=246 frameborder=no border=0 MARGINWIDTH=0 MARGINHEIGHT=0 SCROLLING=no></iframe>"
document.write(msg1)
}
if (ad==4) {
var msg1="<iframe src=http://www.asiacool.com/joke/j4.htm width=773 height=246 frameborder=no border=0 MARGINWIDTH=0 MARGINHEIGHT=0 SCROLLING=no></iframe>"
document.write(msg1)
}
if (ad==5) {
var msg1="<iframe src=http://www.asiacool.com/joke/j5.htm width=773 height=246 frameborder=no border=0 MARGINWIDTH=0 MARGINHEIGHT=0 SCROLLING=no></iframe>"
document.write(msg1)
}