How to add xmlns:fb="http://www.facebook.com/2008/fbml" to html element

While installing Drupal for Facebook, "In order to display FBML tags, IE requires the attribute: xmlns:fb="http://www.facebook.com/2008/fbml" in the tag" But can not find the tag inside ../themes/at-commerce/templates/page.tpl.php And it seems conflict if I added...

24 Jun 2012 ... While installing Drupal for Facebook, "In order to display FBML tags, IE requires the attribute: xmlns:fb="http://www.facebook.com/2008/fbml" in ...

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