function showSubmenu(obj)
{
	var submenus = obj.getElementsByTagName("ul");
	var parentObj = obj.parentNode;
	var brothersList = parentObj.childNodes;
	var i;
	
	for (i = 0; i < brothersList.length; i++)
	{
		
		if (brothersList[i].nodeName == "LI")
		{
			hideSubmenu(brothersList[i],"");
		}
	}
	
	for (i = 0; i < submenus.length; i++)
	{
		submenus[i].className = "sousmenu_visible";
		submenus[i].style.visibility = "visible";
	}
}

function hideSubmenu(obj,cls)
{
	var submenus = obj.getElementsByTagName("ul");
	var parentList = obj.parentNode;
	var brothersList = parentList.childNodes;
	var i;
	
	for (i = 0; i < submenus.length; i++)
	{
		submenus[i].className = "sousmenu_invisible";
		submenus[i].style.visibility = "hidden";
	}
}