On line 186
Could you add an alt tag to the RSS image?
$rssLink= 'term_id) .
'"> <img alt="rss" src="' .get_settings(siteurl) .
'/wp-includes/images/rss.png" />';
$rssLink= 'term_id) .
'"> <img src="' .get_settings(siteurl) .
'/wp-includes/images/rss.png" />';