It is not according to TOS:
Quote:
Thank you for your email. We constantly monitor all click and impression
activity for sites displaying Google ads as part of our efforts to prevent
invalid clicks and impressions from being charged to our advertisers.
Sites which automatically reload webpages in order to show different ads
currently do not comply with Google AdSense policies as this practice
could potentially inflate the number of ad impressions. More information
can be found in our Terms and Conditions (
http://www.google.com/adsense/terms ) and our program policies (
http://www.google.com/adsense/policies )
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So... for the moment this is not legal. IMO opinion this rule is stupid: I am not paid for impressions any way.
Regards,
Razvan