theme superfish menu item link add query string
I think your problem is in how you add the query string. Check this article: Webemania | How and why to use l() function to create links in Drupal and specifically example 6.

&lt;?php
// adding query string on example:5
print l(  t('PHP ini configuration'),  'node/33',  array('attributes' =&gt;array('class'=&gt;'php-ini-conf', 'id'=&gt;'phpini-conf'), 'query'=&gt;array('id'=&gt;'5','status'=&gt;'ok') ));
?&gt;