El submenú queda detrás

[margafes]

Hola de nuevo!! Os mando el código como lo tengo ahora, aunque he probado muchas mas opciones :

@charset "UTF-8";

/* SpryMenuBarVertical.css - Revision: Spry Preview Release 1.4 */

/* Copyright (c) 2006. Adobe Systems Incorporated. All rights reserved. */

/************************************************** *****************************

LAYOUT INFORMATION: describes box model, positioning, z-order

************************************************** *****************************/

/* The outermost container of the Menu Bar, a fixed width box with no margin or padding */
ul.MenuBarVertical
{
font-size: 16px;
cursor: default;
width: 13em;
font-family: Geneva, Arial, Helvetica, sans-serif;
font-weight: bold;
height: 4em;
margin: 0px;
padding-left: 0px;
color: #000000;

}
/* Set the active Menu Bar with this class, currently setting z-index to accomodate IE rendering bug: http://therealcrisp.xs4all.nl/meuk/IE-zindexbug.html */
ul.MenuBarActive
{
z-index: 1000;
}
/* Menu item containers, position children relative to this container and are same fixed width as parent */
ul.MenuBarVertical li
{
padding: 0;
font-size: 100%;
position: relative;
text-align: left;
cursor: pointer;
width: 12.6em;
height: 2em;
margin-top: 0px;
margin-left: 0;
list-style-type: none;
color: #000000;
visibility: visible;

}
/* Submenus should appear slightly overlapping to the right (95%) and up (-5%) with a higher z-index, but they are initially off the left side of the screen (-1000em) */
ul.MenuBarVertical ul
{
padding: 0;
list-style-type: none;
font-size: 100%;
position: absolute;
z-index: 9999;
cursor: default;
width: 12em;
left: -1000em;
top: 0;
margin-top: -5%;
margin-right: 0;
margin-bottom: 0px;
margin-left: 95%;
color: #000000;
}
/* Submenu that is showing with class designation MenuBarSubmenuVisible, we set left to 0 so it comes onto the screen */
ul.MenuBarVertical ul.MenuBarSubmenuVisible
{
left: 0;
visibility: visible;

}
/* Menu item containers are same fixed width as parent */
ul.MenuBarVertical ul li
{
width: 18em;
height: 2em;
background-color: #FFFFFF;

}


/************************************************** *****************************

DESIGN INFORMATION: describes color scheme, borders, fonts

************************************************** *****************************/

/* Outermost menu container has borders on all sides */
ul.MenuBarVertical
{
border: 0px;
}
/* Submenu containers have borders on all sides */
ul.MenuBarVertical ul
{
border: 0px;
}
/* Menu items are a light gray block with padding and no text decoration */
ul.MenuBarVertical a
{
display: block;
cursor: pointer;
color: #000000;
text-decoration: none;
background-color: #FFFFFF;
padding: 0.2em;
margin: 0.8px;
margin-left: 10px;
margin-top: 10px;

}
/* Menu items that have mouse over or focus have a blue background and white text */
ul.MenuBarVertical a:hover, ul.MenuBarVertical a:focus
{
background-color: 0;
color: 0;
}
/* Menu items that are open with submenus are set to MenuBarItemHover with a blue background and white text */
ul.MenuBarVertical a.MenuBarItemHover, ul.MenuBarVertical a.MenuBarItemSubmenuHover, ul.MenuBarVertical a.MenuBarSubmenuVisible
{
background-color: #0066FF;
color: #FFF;
text-decoration: none;
}

/************************************************** *****************************

SUBMENU INDICATION: styles if there is a submenu under a given menu item

************************************************** *****************************/

/* Menu items that have a submenu have the class designation MenuBarItemSubmenu and are set to use a background image positioned on the far left (95%) and centered vertically (50%) */
ul.MenuBarVertical a.MenuBarItemSubmenu
{
background-image: url(SpryMenuBarRight.gif);
background-repeat: no-repeat;
background-position: 95% 50%;
}

/* Menu items that are open with submenus have the class designation MenuBarItemSubmenuHover and are set to use a "hover" background image positioned on the far left (95%) and centered vertically (50%) */
ul.MenuBarVertical a.MenuBarItemSubmenuHover
{
background-image: url(SpryMenuBarRightHover.gif);
background-repeat: no-repeat;
background-position: 95% 50%;
}

/************************************************** *****************************

BROWSER HACKS: the hacks below should not be changed unless you are an expert

************************************************** *****************************/

/* HACK FOR IE: to make sure the sub menus show above form controls, we underlay each submenu with an iframe */
ul.MenuBarVertical iframe
{
position: relative;
z-index: 1010;
}
/* HACK FOR IE: to stabilize appearance of menu items; the slash in float is to keep IE 5.0 from parsing */
@media screen, projection
{
ul.MenuBarVertical li.MenuBarItemIE
{
display: inline;
f\loat: left;
background: #FFF;
}
}


Queria enviar una imagen de la web pero no se.

Os agradezco vuestro tiempo. Gracias.