title: "Uncaught TypeError: undefined is not a function" JavaScript error using noobslider and mootools
body: <p>I'm new to Javascript and have been attempting to use a Slider called noobSlide (mootools) but, after one success with it, have found it broken on my second attempt. </p>
  
  <p>The error that I'm getting reads "Uncaught TypeError: undefined is not a function" in reference to this line of code: </p>
  
  <pre><code>var thumbsFx = new Fx.Style(thumbs_mask7,'left',fxOptions7);
  </code></pre>
  
  <p>I've included all of the necessary libraries for Mootools and the Slider scripts in the head of my pages, and have combed the HTML, but can't find a solution. It seems to be pointing me to the Mootools library but I know that isn't right since, as I said, I've already succeeded with it once using another example.</p>
  
  <p>If it helps, here is the page housing all of the samples of the Slider (I'm trying to use #7 and have already used #3).</p>
  
  <p><a href="http://www.efectorelativo.net/laboratory/noobSlide/" rel="nofollow">http://www.efectorelativo.net/laboratory/noobSlide/</a></p>
  
  <p>If anyone can see where the source of the problem may be, I would really appreciate your eyes :)</p>
  
  <p>Thanks,</p>
  
  <p>Juliana</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
      window.addEvent('domready',function(){
  
          //SAMPLE 7
          var startItem = 0; //or   0   or any
          var thumbs_mask7 = $('thumbs_mask7').setStyle('left',(startItem*60-568)+'px').setOpacity(0.8);
          var fxOptions7 = {duration:1000, transition:Fx.Transitions.Back.easeOut, wait:false};
          var thumbsFx = new Fx.Style(thumbs_mask7,'left',fxOptions7);
          var hs7 = new noobSlide({
              box: $('box7'),
              items: [0,1,2,3,4,5,6,7],
              handles: $ES('span','thumbs_handles7'),
              fxOptions: fxOptions7,
              onWalk: function(currentItem){
                  thumbsFx.start(currentItem*60-568);
              },
              startItem: startItem
          });
          hs7.walk(0);
      });
  
      &lt;/script&gt;
  </code></pre>