saeid_niaz on "space below the menu bar after removing page titles"

hi
I used the solution on this page to remove the titles of the page for 2011 theme.
http://wordpress.org/support/topic/twentyeleven-hideremove-page-title
it works fine, however, there are an empty space below the menu bar for all pages, How can I remove this space. here is my site url: http://niazmardi.byethost13.com/

thanks in advance !