My verticle Spry menu will not work in Internet Explorer

Question

I know a lot of people have posted about similar issues, and I've researched multiple "solutions" on multiple forums for something that will work, but nothing has solved the problem so far.
Here is a link to the prototype homepage: http://www.abrasivesales.com/indexnew.html
Everything looks great on my mac when opened in Firefox or Safari, however when opened on Internet Explorer on a PC, the menu ceases to be verticle, instead extending horizontally past the end of the screen.  Also, the menu items adopt a white background color, and none of the submenu items will appear when their parent menu item is rolled over.
PLEASE HELP....this issue has kept me from launching the site for a week now, and my superiors are wondering why this problem is taking me longer than it did to build the homepage in the first place, so I'd love to look like less of an idiot.
I assuming this is a CSS issue, so I've posted my CSS code below:
@charset "UTF-8";
/* SpryMenuBarVertical.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, a fixed width box with no margin or padding */
ul.MenuBarVertical
    margin: 0;
    padding: ;
    list-style-type: none;
    font-size: 12px;
    cursor: default;
    font-weight: bold;
    font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
    left: 0px;
    top: 0px;
/* 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
    list-style-type: none;
    font-size: 100%;
    position: relative;
    text-align: left;
    cursor: pointer;
    width: 150px;
    margin: 0;
/* 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
    margin: 0 0 0 100%;
    padding: 0;
    list-style-type: none;
    font-size: 100%;
    position: absolute;
    z-index: 1020;
    cursor: default;
    left: -1000em;
    top: 0;
/* 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;
    width: 165px;
/* Menu item containers are same fixed width as parent */
ul.MenuBarVertical ul li
    width: auto;
#masterContainer #container #sidebar #sideNav2 li ul li {
    top: -400px;
DESIGN INFORMATION: describes color scheme, borders, fonts
/* Outermost menu container has borders on all sides */
ul.MenuBarVertical
    border: 0
/* Submenu containers have borders on all sides */
ul.MenuBarVertical ul
    border: 0
/* Menu items are a light gray block with padding and no text decoration */
ul.MenuBarVertical a
    display: block;
    cursor: pointer;
    padding: 2px 3px;
    color: #333;
    text-decoration: none;
    font-family: "Comic Sans MS", cursive;
    font-size: 13.5px;
/* 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: #33C;
    color: #FFF;
/* 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: #1A6AF4;
    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.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: 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.MenuBarVertical li.MenuBarItemIE
        display: inline;
        f\loat: left;
        background: #FFF;
#masterContainer #container #sidebar #sideNav2 {
#masterContainer #container #sidebar li ul li  {
    background-color: #F4EC9A;
/* 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;
float: left;

Answer 1

I solved one of my own problems.  It turns out I still had a setting for width set to "auto" instead of a pixel amount.  So now my menu displays normally and my submenus are no longer invisible.
One one tab, "Products", I set the top at -430px, which internet explorer seems to ignore.  I'm so close!  I'll search for the answer but any help is greatly appreciated.