function openCascade_handler ( e ) {
	var menuItem = getEventSource( e );
	while ( menuItem != null ) {
		if ( checkClassName( 'menu-item', menuItem )) {
			break;
		}
		menuItem = menuItem.parentNode;
	}
	var menuCascade = getElementsByClassName( "menu-cascade", menuItem );
	if ( menuCascade ) {
		toggleElement( menuCascade[0] );
		return false;
	}
}