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ad.php:
<?php
$ads = file('ads.txt');
echo $ads[array_rand($ads)];
?>
ads.txt would contain your iframe / banner html. One entry per line, no blank lines.
ie:
<iframe src="http://www.domain.com/iframe_1.html"...></iframe>
<iframe src="http://www.domain.com/iframe_2.html"...></iframe>
etc.
Then just include it <?php include("ad.php"); ?> where you want it.
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