title: Jquery $ not defined
body: <p>Im trying to animate my website but i keep getting the error "$ not defined" here's my code:</p>
  
  <pre><code>$(document).ready(function() {
  
   spectrum();
  
    function spectrum(){
      var hue = 'rgb(' + (Math.floor(Math.random() * 256)) + ',' + (Math.floor(Math.random() *      256)) + ',' + (Math.floor(Math.random() * 256)) + ')';
      $('#div').animate( { backgroundColor: hue }, 1000);
      spectrum();
   }
  
  });
  </code></pre>