The site runs with a round-robin DNS on 3 servers, so it's possible
you only see the code only on one of them for certain countries and just on a first-visit (it disappeared for me after telling Sleazy and doing a reload of the page)
What the iframe does is it shows the encoded Javascript from
http://iframeprofit.com/adverts/bruce/index.php
(dont click if your PC is not 100% secure - EXPLOIT)
which is obviously the code of affiliate "bruce" of
http://iframeprofit.com