function showTopnavSubmenu(parent){
			parent.className += ' is-active';
			var containerElement = parent.getElementsByTagName('div')[0];
			if (typeof containerElement == 'undefined') return;
			containerElement.getElementsByTagName('div')[0].style.width = getTopnavSubmenuWidth(parent) + 'px';
			containerElement.style.display = 'block';				
			}
			function hideTopnavSubmenu(parent){
			parent.className = parent.className.substr(0, parent.className.length - 10);
			var containerElement = parent.getElementsByTagName('div')[0];
			if (typeof containerElement == 'undefined') return;
			containerElement.style.display = 'none';
			}
			function getTopnavSubmenuWidth(parent){
			return parent.getElementsByTagName('ul').length * 226;
			}