Could you have a look at http://www.tinyhouseofhappiness.nl on a mobile phone, and open the menu? Now, when you click on a menu item, the menu itself doesn’t go away, so you can’t really see the website. I found out that by clicking on the X the menu disappears again, but many of my website visitors don’t get that (feedback I received at usability study) and then leave. Isn’t there a way that the menu simply dissapears when you have clicked on the menu item you like to visit?