Well it's got to be something to do with a plugin that is only displaying info on single posts requiring the jquery library
On single you have this in your head:
<script src="http://www.adverbox.com/admin/wordpress/wp-includes/js/jquery/jquery.js?ver=1.2.6" type="text/javascript">
</script>
<script src="http://www.adverbox.com/admin/wordpress/wp-includes/js/jquery/suggest.js?ver=1.1b" type="text/javascript">
I've got to run and finish cooking dinner right now so I can't be sure what is calling the jquery, but I can only assume it's a widget or plugin that only comes into effect on the single page.
That does make me thing that it's probably necessary, but I can't be sure.