title: MouseMove issue on canvas
body: <p>I'm attempting to get a square shape to follow my mouse around on the canvas using "mousemove".</p>
  
  <pre><code>function start(){
      var canvastmp = document.getElementById("myCanvas")
      var canvas = canvastmp.getContext("2d");
      window.addEventListener('mousemove', trevor, false);
  }
  function trevor(pos){
      canvas.clearRect(0,0,600,400);
      var x = pos.clientX;
      var y = pos.clientY;
      canvas.fillRect(x-25,y-25,100,100);
  }
  window.addEventListener('load',start,false);
  </code></pre>
  
  <p>When I run it, nothing at all shows up. I've been tweaking it and scouring it for a while now, and I can't seem to figure out what's wrong. Again, I'm sorry for the totally nooby question! Any help at all is much appreciated.</p>
  
  <p>Also, I'm using Chrome, if that helps.</p>