I don’t get any bullets. However, on the inner pages, I don’t see the opening UL...
<div id="leftside">
<h2 class="hide">Sample menu:</h2>
<li >
<a href="/index.php?id=3" title="weekmenu's" >Weekmenu's</a>
<li >
<a href="/index.php?id=14" title="test" >test</a>
</li>
The home page is different...
<ul class="navigation"><li><a href="/index.php?id=3" title="weekmenu's" >Weekmenu's</a></li>
<li><a href="/index.php?id=4" title="Kant en klaar maaltijden" >Kant en klaar maaltijden</a></li>
<li><a href="/index.php?id=5" title="Bereken uw ideale gewicht" >Bereken uw ideale gewicht</a></li>
<li><a href="/index.php?id=6" title="Nieuws" >Nieuws</a></li>
<li><a href="/index.php?id=7" title="forum" >forum</a></li>
<li><a href="/index.php?id=8" title="Online diëtiste" >Online diëtiste</a></li>
<li><a href="/index.php?id=9" title="Korting" >Korting</a></li>
<li class="last"><a href="/index.php?id=16" title="Bestelformulier" >Bestelformulier</a></li>
</ul>
That missing <ul class="navigation"> is breaking your menu in the inner pages. You should always run a page through the W3C Validator if you’re having styling problems. 9 times out of 10 it’s something like this.
http://validator.w3.org/check?uri=http%3A%2F%2Fwww.kwestievan.nu%2F&charset=%28detect+automatically%29&doctype=Inline&group=0
The error on the home page is just the target="_blank" in a link XHTML foolishness.
But the inner pages...
http://validator.w3.org/check?uri=http%3A%2F%2Fwww.kwestievan.nu%2Findex.php%3Fid%3D4&charset=%28detect+automatically%29&doctype=Inline&group=0