Good way to have built in ad system?

[yeti]

How can i have my own built in ad system so that i could either pick which images link where, or people can purchase and have their banner(s) shown?

Is there a script that could do this? I already have MyAd manager, and so i am just looking for a script that could have it set up for users to purchase ads on my site and it would be placed automatically.

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So far i have found http://www.adpeeps.com

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i have found http://www.phpwebscripts.com/admanagerpro/

[NetSage]

http://www.openx.org/

Assuming you mean paid that's what you want.

[yeti]

and this is free?

wow, im gonna try it out

thanks

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actually it seems like it might be to complex or its only good for really really big sites from what i was told?