Horizontal Spry Menu appears as bullet point list in IE8 and below - fine in firefox, chrome and IE9

Question

This one is breaking my brain! I have an horizontal spry menu bar in my website that renders correctly in all browsers except ie 8 and below where it appears like an unordered list - almost like no CSS had been applied at all. You can check out the site here http://www.webhance.com.au. The spry css looks like this:
@charset "UTF-8";
/* SpryMenuBarHorizontal.css - version 0.6 - Spry Pre-Release 1.6.1 */
/* Copyright (c) 2006. Adobe Systems Incorporated. All rights reserved. */
LAYOUT INFORMATION: describes box model, positioning, z-order
/* The outermost container of the Menu Bar, an auto width box with no margin or padding */
ul.MenuBarHorizontal
margin: 0;
padding: 0;
list-style-type: none;
font-size: 130%;
cursor: default;
width: auto;
float:right;
/* 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: 100%;
position: relative;
cursor: pointer;
width: 150px;
float: right;
text-align:center;
font-family:"AvantGarde Bk BT";
/* 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: 150px;
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: auto;
/* Menu item containers are same fixed width as parent */
ul.MenuBarHorizontal ul li
width: 150px;
/* 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-right: 1px solid #9fe2fd;
text-align:center;
font-family:"AvantGarde Bk BT";
background-color:#4c859d;
color:#FFF;
/* Menu items are a light gray block with padding and no text decoration */
ul.MenuBarHorizontal a
border-right: 1px solid #9fe2fd;
display: block;
cursor: pointer;
background-color: #4c859d;
padding: 0.5em 0.75em;
color: #FFF;
text-decoration: none;
/* 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: #4c859d;
color: #9cc9a0;
/* 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: #4c859d;
color: #9cc9a0;
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(SpryMenuBarDown.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(SpryMenuBarDownHover.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;
float: left;
background: #FFF;
The HTML for the section looks like this:
<div class="header">
  <ul id="MenuBar1" class="MenuBarHorizontal">
  <li><a href="index.html" id=button1>Home</a></li>
  <li><a class="MenuBarItemSubmenu" href="#">Services</a>
    <ul>
      <li><a href="design.html">Web Design</a>        </li>
      <li><a href="maintenance.html">Web Maintenance</a></li>
      <li><a href="social.html">Social Media</a></li>
    </ul>
  </li>
  <li><a href="portfolio.html">Portfolio</a></li>
  <li><a href="contact.html">Contact</a>    </li>
</ul>
<!-- end .header --></div>
I really really need some help - hope someone out there can point me in the right direction :-)
Julie

Answer 1

Hi Gramps - thanks for getting back to me - I took advantage of your advice to others with some other issues I had and they worked a charm so I was really hoping to hear from you :-)
Unfortunately removing media="only screen and (min-width: 769px) from the css call didn't resolve the problem.  Check it out on my index page www.webhance.com.au/index.html Any other ideas?
Cheers, Julester