There is no real need for Kcup to be a link anyway because when js is disabled the menu is expanded by default. So you could use a span instead of an anchor and just style it to look the same.
A quick fix would be just to remove the href destination.
<li class="submenu"><a href="#nogo">KCup</a>
Now when clicked it will not go anywhere. The semantic solution though is to change that anchor to a more suitable element such as a span or perhaps a heading tag of the appropriate level might be more appropriate.
There is probably a JS solution also in making the link when clicked returned false so that it doesn't follow but that's a question for the JS forum.