Buttons don't appear when retrieving more data from database unless refreshed

[Guitars4God7]

I am working on a page that will load more content from a database using php, mootools, and ajax. So far it works perfectly adding 3 more posts every time and scrolling except the facebook like buttons won't show until the page is refreshed. I could always force the page to refresh onComplete but it doesn't look good and would no longer scroll as desired. Here is the testing site and I would really appreciate if someone has any idea as to what I'm doing wrong. Thanks! Chance

http://guitars4god7.dyndns.org:81/mootools-version.php