Originally Posted by Rorschach

Put your iframe code in various text files, eg. 1.html -> 6.html. Include the entire iframe code from opening iframe tag to the closing tag.

Put this code where you want to place your rotating iframe:

<?php

$max = 6;

$i = mt_rand(1, $max);

include("$i.html");

?>

You can change the value of $max depending on how many iframe text files you have.