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Indexation of ad-server code may prove tricky as often it will have a generic & dynamic make-up (i.e. JavaScript). It depends on how you set-up the code and ultimately how your engine will serve the code to end users. What you are wanting to achieve is definitely possible through automation (whether via an ad-server or a custom script). The variable is just how the ad-server you use serves the listings. (You might like to try DoubleClick or OpenX first. Both are free). Best of luck! Anthony