This is done in the HTML Generator. On the HTML Generator
Screen there is an option that says "Ad Grouping" by default
it's off, turn on and use this code.
With Ad Grouping, if the advertiser has more than 1 ad, it
will select 1 randomly and use that one when deciding which
to show compared to other ads.
With this setting off, it would take all the ads and then
decide. Because the advertiser has more ads than other
advertisers they may get an unfair advantage in terms of