Interesting, i loaded the forum in FF just to test it and i got a popup window and inside that window was this, so maybe something is not correct with the way this was done?
Code:
document.write ('<A HREF="http://oasc05134.247realmedia.com/RealMedia/ads/click_lx.ads/IDGidg10/technology/1{TIME_DATE_STAMP}/1262307353/x95)/default/empty.gif/517743334956457a426f59414449674e?x" target="_top"><IMG SRC="http://imagec17.247realmedia.com/RealMedia/ads/Creatives/default/empty.gif/0" WIDTH=1 HEIGHT=1 ALT="" BORDER=0 BORDER="0"></A>');