tene colocar isso o fim do seu css? /* Micox Pseudo-class-css2 to IE (MXPC). Activate .hover and .first-child in IE 6 */
* html * { color: expression( (function(who){ if(!who.MXPC){
who.MXPC = '1';
if(who.nodeName != 'A'){
who.onmouseenter=function(){ who.className += ' hover'};
who.onmouseleave=function(){ who.className = who.className.replace(' hover','')}; }
(who==who.parentNode.firstChild) ? who.className += ' first-child' : '';
} } )(this) , 'auto') }
ul li:hover ul, ul li.hover ul{
}