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<?php
// Hook into the admin footer
add_action( 'admin_footer-user-edit.php', 'remove_user_fields' );

// Print jQuery that removes unneeded elements
function remove_user_fields(){
  ?>
  <script type="text/javascript">
    jQuery(document).ready( function($) {
      var ids = ['#rich_editing', // Rich editing button
                 '#admin_color_classic', // Admin color scheme
                 '#comment_shortcuts', // Keyboard shortcuts for comment moderation
                 '#aim', // AOL instant messenger
                 '#yim', // Yahoo messenger
                 '#jabber', // Jabber
                 '#description']; // User bio
      for (var i = 0; i < ids.length; i++) {
        $(ids[i]).closest('tr').remove();
      }
    });
  </script>
  <?php
}