Simple and clean, good job!
One small suggestion: The navigation will be clearer if you style the li.menuactive / li.activeparent in your horizontal menu. This way the visitor will always (intuitively!) know where on the site she is. The change in style need not be big, only a slight difference in font color, or font weight would probably do the trick.
Cheers!
Z
My latest website - Society for Antwerp History - gvag.be
Re: My latest website - Society for Antwerp History - gvag.be
Might want to do the same for hover, but I'm just like that 
