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// remove nofollow from comments
function xwp_dofollow($str) {
  $str = preg_replace(
		'~<a ([^>]*)s*(["|']{1}w*)s*nofollow([^>]*)>~U',
		'<a ${1}${2}${3}>', $str);
	return str_replace(array(' rel=""', " rel=''"), '', $str);
}
remove_filter('pre_comment_content',     'wp_rel_nofollow');
add_filter   ('get_comment_author_link', 'xwp_dofollow');
add_filter   ('post_comments_link',      'xwp_dofollow');
add_filter   ('comment_reply_link',      'xwp_dofollow');
add_filter   ('comment_text',            'xwp_dofollow');