var ie = /MSIE/.test(navigator.userAgent);

function hover(obj) {
  if (ie) {
    UL = obj.getElementsByTagName('ul');
    if (UL.length > 0) {
      sousMenu = UL[0].style;
      sousMenu.display = 'block';
    }
  }
}

function out(obj) {
  if (ie) {
    UL = obj.getElementsByTagName('ul');
    if(UL.length > 0) {
      sousMenu = UL[0].style;
      sousMenu.display = 'none';
    }
  }
}

function setHover() {
  if (ie) {//alert(document.getElementById('bt01').getElementsByTagName('ul')[0].id);
  		document.getElementById('bt01').onmouseover = function() { hover(this) };
		document.getElementById('bt01').onmouseout = function() { out(this) };
		LI = document.getElementById('menuTerritoires').getElementsByTagName('li');
		for(i=0; i < LI.length; i++) {
			LI[i].onmouseover = function() { hover(this) };
			LI[i].onmouseout = function() { out(this) };
   		}
		LI = document.getElementById('menu2').getElementsByTagName('li');
		for(i=0; i < LI.length; i++) {
			LI[i].onmouseover = function() { hover(this) };
			LI[i].onmouseout = function() { out(this) };
    	}
		LI = document.getElementById('menu3').getElementsByTagName('li');
		for(i=0; i < LI.length; i++) {
			LI[i].onmouseover = function() { hover(this) };
			LI[i].onmouseout = function() { out(this) };
    	}
  }
}
//window.onload = function() { alert('ok');setHover(); };

setTimeout(setHover,2000);