Can someone assist me?
I am getting a website, builed with WordPress however it just appears to fail within the TopMenu part, thos key to my website.

My website
Just hold your mouse on "seizoen 2010" and discover the main difference with "seizoen 2009".

Hope someone understands how to fix this problem cause it's annoying as hell!
Thanks ahead of time!

You need to modify css rules for #front_menu li ul ul For instance :

#front_menu li ul ul {
    border-top: 1px solid #ACACAB;
    left: 100px;