That's what I explained in my previous message with the example of "weather" and "cars".

You create 2 zones by duplicating your file ads.pl and renaming with the name of your zone. For example If you want ads on your index page you can create a zone called "ads_indextop.pl" and call it at the top of your index page and another zone called "ads_indexbottom.pl" that you call at the bottom of the index page, so long and so forth, you can create zone "ads_indexmiddle.pl" "ads_indexmiddle2.pl" etc.

you stick that on your index page where you want banners to show up by using the exec function on your index page assuming this index page is called index.shtml not index.html