function display_list(menu_id, controller_reference)
	{

		menu_reference = document.getElementById(menu_id);
	
		if(menu_reference.style.display == 'none')
		{
			menu_reference.style.display = 'block';
			controller_reference.parentNode.style.backgroundImage =  "url(http://www.theloughroad.com/images/SiteMap/site_map_minus.gif)";
		}	
		else
		{
			menu_reference.style.display = 'none';
			controller_reference.parentNode.style.backgroundImage =  "url(http://www.theloughroad.com/images/SiteMap/site_map_plus.gif)";
		}
	}