Hi Tia,
The r= parameter is simply there to prevent customers browsers from caching the banners on your site. This means that if you put a random number into every banner, then impression stats that you see will be much more accurate. Additionally if you've created any weighted banners, this is the only way to ensure that the banners are rotated every time the banner is called.
It's completely up to you whether you actually put in a random number, it doesn't affect the tracking in any way at all.
If you have any further questions, please drop me an e-mail.
Thanks very much
Stephanie
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