Animation not working

Animation not working

I'm at a loss here.  The following code works perfectly fine on my development machine.  It doesn't work on the server and throws an illegal character exception error instead.  For the life of me, I can't figure out what it is.  

  2. $(document).ready (function () {
  3.  $('#side_menu').fadeIn('fast', function() {
  4.         $('#side_menu').css('display','block');
  5.         $('#side_menu').animate({'right':'0%'},300);
  6.     });
  7. });
When I comment out the fadeIn, all other calls to the side_menu id work fine - even on the server.  What am I missing here?