According to the Facebook developer roadmap, it will soon be possible to put iframes inside page tabs but it's not yet available. I came across this Store Locator on Coach page which uses an iframe to display a Google map inside a tab :
http://www.facebook.com/Coach?v=app_168904438199&ref=ts
Looking at the source code, I see the map really is inside an iframe. How is this possible?
in STATIC FBML pages you CAN'T USE IFRAMES - no matter what FBML code you put in there, facebook have specifically made the code not work in in business page/tab static fbml pages - my guess is so they can prevent people setting up Amazon stores or other content that uses IFrame (spammers and spyware often use iframes) - the updates are in their 2010 wiki - so it's probabley also a security thing.
I frames can still be used on developers canvas pages apparently but the customer has to click on an image for it to activate rather than the iframe automatically loading - again this is probably a security issue to prevent driveby downloads - where zwinky and similar toolbars are forced onto people computers in the background via iframes without their knowledge.
However some say it does work although you need a user to click on it before it works. if you can live with that then go for it.
<a onClick="outside_location.setInnerFBML(location_two);" style="cursor: pointer;"><center>→our website</center></a><div id="outside_location"> <fb:iframe width="730" height="400" frameborder="0" src="http://www.fborder.com/" /> </div>
<fb:js-string var="location_two"> <fb:iframe width="730" height="600" frameborder='0' src='http://www.fborder.com/' /> </fb:js-string> <script type="text/javascript" charset="utf-8"> var outside_location = document.getElementById('outside_location'); </script>
check out this post. people have got it to work. and some say it wont work for the obvious reasons. such as security and so on. but give it a go regardless.
http://www.facebook.com/topic.php?uid=4949752878&topic=7081
PK