// include in all pages where you want the menu
document.write('<div id="navbar"><ul>');  
document.write('    <li><a href="index.html">Welcome</a></li>');
document.write('    <li><a href="concerts.html">Concerts</a></li>');
document.write('    <li><a href="conductor.html">Conductor</a></li>');
document.write('    <li><a href="join.html">Join</a></li>');
document.write('    <li><a href="committee.html">Committee</a></li>');
document.write('    <li><a href="history.html">History</a></li>');
document.write('</ul></div>');