Positioning of spry sub menu in IE8

Question

Hi - can anyone help with an IE8 issue concerning Spry? I have created a menu here:
http://www.clinicafiore.co.uk/jan2012/indexJan2012_1.html
In all the browsers I have tested (Chrome,FF,Safari,Opera) on Mac and PC platforms it works fine. In IE8 it doesn't (hooray).
The critical attribute is:
ul.MenuBarHorizontal ul.MenuBarSubmenuVisible
  left: 189px;
  top: 0;
I.e. I have pushed the sub-menu out 189px when visible and set the top value to 0 thinking this would align the sub-menu with the top of the main menu item.
Is there a better way to do this to cover all browsers or do I need some conditional code for IE?
Really.really grateful for any help
For good measure here's all the  html & the css
HTML
<div id="leftNav">
    <ul id="MenuBar1" class="MenuBarHorizontal">
      <li><a href="#" title="ageing body" class="MenuBarItemSubmenu">AGEING BODY</a>
        <ul>
          <li><a href="#">Ageing D&eacute;collet&eacute;</a></li>
          <li><a href="#">Ageing Hands</a></li>
          <li><a href="#">Ageing Neck</a></li>
        </ul>
      </li>
      <li><a href="#" class="MenuBarItemSubmenu">ageing face</a>
        <ul>
          <li><a href="#">Ageing Lips</a></li>
          <li><a href="#">Double Chin</a></li>
          <li><a href="#">Downturned Mouth</a></li>
        </ul>
      </li>
      <li><a class="MenuBarItemSubmenu" href="#">Item 3</a>
        <ul>
          <li><a class="MenuBarItemSubmenu" href="#">Item 3.1</a>
            <ul>
              <li><a href="#">Item 3.1.1</a></li>
              <li><a href="#">Item 3.1.2</a></li>
            </ul>
          </li>
          <li><a href="#">Item 3.2</a></li>
          <li><a href="#">Item 3.3</a></li>
        </ul>
      </li>
      <li><a href="#">Item 4</a></li>
    </ul>
  </div>
CSS
ul.MenuBarHorizontal
          margin: 0;
          padding: 0;
          list-style-type: none;
          font-size: 0.9em;
          cursor: default;
          width: auto;
/* 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 a fixed width */
ul.MenuBarHorizontal li
          margin: 0;
          padding: 0;
          list-style-type: none;
          font-size: 0.9em;
          position: relative;
          text-align: left;
          cursor: pointer;
          width: 189px;
          float: left;
          font-weight: bold;
          text-transform: uppercase;
/* Submenus should appear below their parent (top: 0) with a higher z-index, but they are initially off the left side of the screen (-1000em) */
ul.MenuBarHorizontal ul
          margin: 0;
          padding: 0;
          list-style-type: none;
          font-size: 100%;
          z-index: 1020;
          cursor: default;
          width: 189px;
          position: absolute;
          left: -1000em;
/* Submenu that is showing with class designation MenuBarSubmenuVisible, we set left to auto so it comes onto the screen below its parent menu item */
ul.MenuBarHorizontal ul.MenuBarSubmenuVisible
          left: 189px;
          top: 0;
/* Menu item containers are same fixed width as parent */
ul.MenuBarHorizontal ul li
          width: 189px;
          font-weight: normal;
          text-transform: none;
/* Submenus should appear slightly overlapping to the right (95%) and up (-5%) */
ul.MenuBarHorizontal ul ul
          position: absolute;
          margin: -5% 0 0 95%;
/* Submenu that is showing with class designation MenuBarSubmenuVisible, we set left to 0 so it comes onto the screen */
ul.MenuBarHorizontal ul.MenuBarSubmenuVisible ul.MenuBarSubmenuVisible
          left: auto;
          top: 0;
DESIGN INFORMATION: describes color scheme, borders, fonts
/* Submenu containers have borders on all sides */
ul.MenuBarHorizontal ul
          border: 1px solid #CCC;
          font-weight: normal;
          text-transform: none;
/* Menu items are a light gray block with padding and no text decoration */
ul.MenuBarHorizontal a
          display: block;
          cursor: pointer;
          background-color: #aee56b;
          padding: 0.5em 0.75em;
          color: #333;
          text-decoration: none;
          border-bottom-width: thin;
          border-bottom-style: dotted;
          border-bottom-color: #FFF;
/* Menu items that have mouse over or focus have a blue background and white text */
ul.MenuBarHorizontal a:hover, ul.MenuBarHorizontal a:focus
          background-color: #999999;
          color: #FFF;
/* Menu items that are open with submenus are set to MenuBarItemHover with a blue background and white text */
ul.MenuBarHorizontal a.MenuBarItemHover, ul.MenuBarHorizontal a.MenuBarItemSubmenuHover, ul.MenuBarHorizontal a.MenuBarSubmenuVisible
          background-color: #999999;
          color: #FFF;
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.MenuBarHorizontal a.MenuBarItemSubmenu
          background-image: url(SpryMenuBarRight.gif);
          background-repeat: no-repeat;
          background-position: 95% 50%;
/* 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.MenuBarHorizontal ul 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.MenuBarHorizontal a.MenuBarItemSubmenuHover
          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.MenuBarHorizontal ul 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.MenuBarHorizontal iframe
          position: absolute;
          z-index: 1010;
          filter:alpha(opacity:0.1);
/* 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.MenuBarHorizontal li.MenuBarItemIE
                    display: inline;
                    f\loat: left;
                    background: #FFF;

Answer 1

I may be misinterpreting what it is that you want, partly because I thought we were talking horizontal menu and you point out a vertical menu.
I think that you used the vertical menu as an illustration to shopw how you want the submenu alligned. If that is correct, then please copy an paste the following into a new document and see the result in an IE8 browser.
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<link href="http://labs.adobe.com/technologies/spry/widgets/menubar/SpryMenuBarHorizontal.css" rel="stylesheet">
<style>
ul.MenuBarHorizontal ul {margin-left: 8em; margin-top: -35px;}
</style>
</head>
<body>
<ul id="MenuBar1" class="MenuBarHorizontal">
  <li><a class="MenuBarItemSubmenu" href="#">Item 1</a>
    <ul>
      <li><a href="#">Item 1.1</a></li>
      <li><a href="#">Item 1.2</a></li>
      <li><a href="#">Item 1.3</a></li>
    </ul>
  </li>
  <li><a href="#">Item 2</a></li>
  <li><a class="MenuBarItemSubmenu" href="#">Item 3</a>
    <ul>
      <li><a class="MenuBarItemSubmenu" href="#">Item 3.1</a>
        <ul>
          <li><a href="#">Item 3.1.1</a></li>
          <li><a href="#">Item 3.1.2</a></li>
        </ul>
      </li>
      <li><a href="#">Item 3.2</a></li>
      <li><a href="#">Item 3.3</a></li>
    </ul>
  </li>
  <li><a href="#">Item 4</a></li>
</ul>
<script src="http://labs.adobe.com/technologies/spry/includes_minified/SpryMenuBar.js"></script>
<script>
var MenuBar1 = new Spry.Widget.MenuBar("MenuBar1", {imgDown:"SpryAssets/SpryMenuBarDownHover.gif", imgRight:"SpryAssets/SpryMenuBarRightHover.gif"});
</script>
</body>
</html>
If the above is not what you want, then please explain.
Gramps