Have now got this working locally using IE8 and an amended CSS file to reflect the new
<DynamicMenuStyleCssClass="dynamicMenu"/> looks like
.dynamicMenu {
background-color:#a83930;
border-color: #fdea12;
border-style: solid;
border-width: 1px;
z-index: 1000;
}

This now works. Have found that the fix works for IE8 BUT does not work for Google Chrome - as can be seen for the Wrox United Website. Any plans to resolve this for an increasingly popular browser ??