var ua = navigator.userAgent.toLowerCase();
var msIE = ((ua.indexOf('msie') != -1) && (ua.indexOf('opera') == -1) && (ua.indexOf('webtv') == -1)); //Is true when using Internet Explorer


if(msIE) {

 var submenu_pg = document.getElementById('menu_pg'); 
 var submenu_prop = document.getElementById('menu_prop');
 
 submenu_pg.onmouseover = function() {
  submenu_pg.getElementsByTagName('ul')[0].style.display = 'block';
 };

 submenu_pg.onmouseout = function() {
  submenu_pg.getElementsByTagName('ul')[0].style.display = 'none';
 }

 submenu_prop.onmouseover = function() {
  submenu_prop.getElementsByTagName('ul')[0].style.display = 'block';
 };

 submenu_prop.onmouseout = function() {
  submenu_prop.getElementsByTagName('ul')[0].style.display = 'none';
 }

}