title: jQuery Mousewheel plugin trigger only once
body: <p>I am using jquery-mousewheel to detect scroll events.
  The thing is that i want to call a function when there is a scroll event, and not call it at every mousewheel event. ( call it only once, at scroll beginning for example )
  Is there a way to do this ? </p>
  
  <p>I'd like something like :  : </p>
  
  <pre><code>$('.inner').mousewheel( event ){
      my_function_to_be_called_only_once()
  }
  </code></pre>