function showSubNavGroup(navGroup) {
	var e = document.getElementById(navGroup);
	e.style.display = 'block';
}

function hideSubNavGroup(navGroup) {
	var e = document.getElementById(navGroup);
	e.style.display = 'none';
}

function navToggle(link, image) {
	var e = document.getElementById(link);
	e.setAttribute('src', image);
}

function setNavColor(menuItem, lang) {
	e = document.getElementById(menuItem);
	e.src =	'./images/menu/'+lang+'/'+menuItem+'_active.gif';
	
	if (menuItem == 'what' || menuItem == 'products' || menuItem == 'projects' || menuItem == 'references') navGroup = 'what';
	if (menuItem == 'news' || menuItem == 'jobs' || menuItem == 'articles' || menuItem == 'newsletter') navGroup = 'news';
	showSubNavGroup(navGroup+'SubNavGroup');
}