Transparent Iframe Body

yes you can (if i understand your question correctly)

heres the code
if you have edit access to the iframe content put this in the head (of the iframe)

<style type="text/css">
 <!-- BODY {background:none transparent;}-->
 </style>

and then embed the iframe like this

<iframe src="https://stackoverflow.com/questions/3064199/frame.htm" allowtransparency="true">