var last_visible = false;
var last_link = false;

function show( number ) {

	var div_ref = document.getElementById( 'submenu_'+number );
	var link_ref = document.getElementById( 'menu_'+number );
	
	
	
	if( div_ref ) {
		if( last_visible ) {
			last_visible.style.display = 'none';
			last_link.className = '';
		}
		if( ( div_ref.style.display == 'none' ) ) {
			if ( last_visible == div_ref ) {												
				last_visible = false;
				last_link = false;
			} else {
				div_ref.style.display = 'block';
				link_ref.className = 'active'
				last_visible = div_ref;
				last_link = link_ref;
			}
		}
	}
}