Menü új ablakban

<nav id="xy-menu">
    <ul class="menu">
        <li><a href="/">Home</a></li>
        <li><a href="http://www.jsfiddle.net" 
               class="new-window" 
               target="mywindow">JSfiddle</a>
        </li>
    </ul>
</nav>

$('#xy-menu a.new-window').click( function (event) {    
  var url = $(event.target).attr('href'),
      target = $(event.target).attr('target') || 'mywindow',
      attrs = 'resizable=no, width=640, height=480';
  event.preventDefault();
  window.open(url, target, attrs);
});