Hoi Johan,
i found a solution that should work. The problem is the z-order of the elements in your template.
In your template.css file, goto line 1550:
.art-post {
padding: 5px;
}
Change that to:
.art-post {
padding: 5px;
position: relative;
z-index: 0;
}
That way, the article content will be lower in the z-order than your menu,
so the menu will be rendered above the map instead of behind it.
hth & cheers, Frank