Hi. My submenu in the main menu of the skin dont work properly/at all

Ive added a page and set the parent page. It doesnt work att all ... Look for your self http://www.nybergsmek.se/nyb/

Just klick the second button in the menu 'Företaget' and youll se the problem, the sub wont show at all something strange happends instead. This is my css for the main menu and the sub menu

<pre>.MainMenu_MenuItem {
align:center;
color: #476F8F;
font-family: Arial, Helvetica;
font-size: 7pt;
cursor: hand;
font-weight:normal;
font-style: normal;
BACKGROUND-IMAGE: url(kn_unselect.gif);
HEIGHT: 21PX;
background-repeat: no-repeat;
padding-left:5px;
padding-right:35px;
text-align: center;
}
And the sub´s css

.MainMenu_SubMenu {
background-color: #CAD5EA;
z-index: 1000;
cursor: hand;
filter:progid:DXImageTransform.Microsoft.Shadow(color='#696969', Direction=135, Strength=3);
} </pre>