gistfile1.js

function showSidenav() {
  // show overlay                                                           
  var $overlayEl = $(mui.overlay('on'));

  // show element                                                           
  $sidenav
    .appendTo($overlayEl)
    .show()
    .animate({left: '0px'}, 150);
};

$('#sidenav-toggle').on('click', showSidenav);