Thanks so much!! I used this code but then it was printing the ads every 3 headlines. I changed this...

    $count++; # umm...err...count
    if ($count > 2) {
[download]

to this...

    $count++; # umm...err...count
    if ($count == 2) {
[download]

Then I reset the counter afterwards from

$count = 0 to $count = 4.

Thanks a bunch!