Close button in Jquery mega menu?

Hi Everybody.

I use the Jquery mega menu on one of my websites i’m building. I just have one huge problem, really would like to add a “close” button inside the drop down menu.

You can see my menu here: http://www.medidyne.dk/wordpress

And you can see what I would like to achieve on this website, when you try to click on the menu: http://www.novonordisk.com