How to load JavaScript inside AJAX area?

[epicrevolt]

Title should be load ajax inside ajax because facebook comments load via ajax
I am building an all AJAX site for a Facebook iFrame page and am having an issue. All the pages and what not load up dynamically just fine, but some pages use the Facebook commet system. After the AJAX has loaded the page though, the JavaScript inside does not load.
This is the Facebook comment script that I need to load inside the ajax'd content.
How would you eval that? (or whatever it is you would do?)

<script>(function(d){
  var js, id = 'facebook-jssdk'; if (d.getElementById(id)) {return;}
  js = d.createElement('script'); js.id = id; js.async = true;
  js.src = "//connect.facebook.net/en_US/all.js#xfbml=1";
  d.getElementsByTagName('head')[0].appendChild(js);
}(document));</script>
<div class="fb-comments" data-href="<?php the_permalink(); ?>" data-num-posts="5" data-width="500"></div>

Any help greatly appreciated.

[epicrevolt]

Solution:
when you load up the ajax page, add this.

FB.XFBML.parse();

also place this in your header

<script src="http://connect.facebook.net/en_US/all.js#appId=YOUR_APP_ID&amp;xfbml=1"></script>