// add a drop-down arrow to each menu item that has a sub-menu
for (menue_id = 0; menue_id < document.getElementById('menu').getElementsByTagName('li').length; menue_id++) {
	menue = document.getElementById('menu').getElementsByTagName('li')[menue_id];
		if (menue.getElementsByTagName('ul').length > 0)
			menue.getElementsByTagName('a')[0].className = 'drop';
}