when ads are not delivered due to some condition which i have put to delivery option or anyother condition then i want to show other optional ads instead of these ads.
so when nothing is delivered then optional ads which i have made will be displayed instead.
i have tried the option
"If no banners from this zone can be delivered, try to... "
in zone>advance
and set the value "Display the selected zone instead"and give optional ads zone name.
But it can't work.
please help me regarding this.how can i achieve this?