The div#header node should only contain elements or options you want to make available to the user before the actual content. Typically the content is the reason why the user navigated to this page, so only elements which might be needed to improve access to content should reside in the header.
<div id="header"> <ul class="servicenavigation"> <li class="keynav navigation"><a href="#navigation" rel="nofollow">To navigation</a></li> <li class="keynav search"><a href="/search" rel="search">Search</a></li> <li class="keynav language en"><a href="?language=en">English</a></li> <li class="keynav language da"><a href="?language=da">Dansk</a></li> </ul> </div>
The keynav class on the ul.servicenavigation elements is an optional indicator, that this element should be extended with keyboard accessibility for visually impaired users. It does not have any functionality built in.