title: addEventListener in Canvas tag
body: <p>I have a canvas tag to create a graphic. At each section of my line, I have a "dot" to enable a 'mouseover' and display more detail.</p>
  
  <p>Everything works fine when I don't add an event listener to this dot.</p>
  
  <p>Firebug is warning me:</p>
  
  <blockquote>
    <p>s.addEventListener is not a function...</p>
  </blockquote>
  
  <p>Is it possible to create dynamic event listener? (I'm new to Javascript)</p>