title: JQuery jerky slideUp and slideDown animation
body: <p>I have a problem with this animation in jquery, it seems to be jerky with all browser.</p>
  
  <p>This is the link:
  <a href="http://www.pierluigiballatore.com/htsun/servizi.html" rel="nofollow">HERE</a></p>
  
  <p>You have to click to "Fotovoltaico" and "Fotovoltaico a concentrazione" for see the animation problem.</p>