title: AS3 How to add seconds to (game) timer after hittest?
body: <p>I have a timer and a dynamic textfield wich displays the time. 
  Everytime my movieclip hits an enemy I want the timer to add 4 sec. to the current count.
  I would like to know why this isn't working:</p>
  
  <pre><code>timer.currentCount + 4;
  </code></pre>
  
  <p>(does nothing)</p>
  
  <pre><code>timer.currentCount += 4;
  </code></pre>
  
  <p>(error: property is read-only)</p>
  
  <p>Am I in the right direction anyway and what should I change?</p>