CSS/javascript menu

Ive made 2 menu's in CSS/javascript but there are some errors on it. Who can help me fixing this, MENU 1 ====== You can find the menu [login to view URL] > notice there is a problem when i hover "muziek", and the "parent tab" (like onderzoek, beleid & historiek) doenst keep the purple background when i hover the subitems in the right part. (functionality has to be like [login to view URL] , not the color, only functionality) MENU 2 ====== The subpage can be found on [login to view URL] the functionality has to be like [login to view URL] (only functionlity, not design or color) Now there is a problem in IE6/IE7 vs Firefox, who can handle this? fast and good?