title: Case-insensitive switch-case
body: <p>OK, so let's say I have this:</p>
  
  <pre><code>$(function() {
    $('#good_evening').keyup(function () {
      switch($(this).val()) {
      case 'Test':
        // DO STUFF HERE
        break;
      }
    });
  });
  </code></pre>
  
  <p>... this would <strong>only</strong> run if you typed "Test" and <em>not</em> "test" or "TEST". How do I make it case-insensitive for JavaScript functions?</p>