Issue implementing Ajax in form
Take the #'s off the nested #ajax values.  IE

  '#ajax' =&gt; array(
      'callback' =&gt; 'formajax_callback',
      'wrapper' =&gt;  'replace_this',
      'effect'  =&gt; 'fade',
      'event' =&gt; 'blur',
      'keypress' =&gt; FALSE,
    ),