Need Javascript menu

Hello, It's not a PHP question but I need your help because, I have to do a "complex" Javascript/DHTML menu. I need a vertical menu, with some items (for example A,B,C and D .. or more). when I click on an item, the item open and I see the subitem, like this : http://www.editeurjavascript.com/scripts/scripts_nav_26.php But when I click on a subitem, I have to have an horizontal menu, like this : http://www.editeurjavascript.com/scripts/scripts_nav_19.php The horizontal menu have to appear in front of the vertical subitem selected and this menu is defferent for each subitem. Have you seen that somewhere ? Christian,