var openmenu = '';

function hide (id) {
	var obj = document.getElementById(id);
	obj.style.display = 'none';
}

function show (id) {
	var obj = document.getElementById(id);
	obj.style.display = 'block';
}

function setOpenMenu( id ) {
	openmenu = id;
}

function showMenu(id) {
	if ( openmenu != '' ) {
		hide( openmenu );
		if ( openmenu != id ) {
			show( id );
			openmenu = id;
		} else {
			openmenu = '';
		}
	} else {
		show( id );
		openmenu = id;
	}
}

var last_visible = false;

function show( div_id ) {
	var div_ref = document.getElementById( div_id );
	if( div_ref ) {
		if( last_visible ) {
			last_visible.style.display = 'none';
		}
		if( ( div_ref.style.display == 'none' ) ) {
			if ( last_visible == div_ref ) {												
				last_visible = false;
			} else {
				div_ref.style.display = 'block';
				last_visible = div_ref;
			}
		}
	}
}