$('html').mousemove(function(e){          
      var width = $('body').width();
      limitl = ((width/2)-208);
      limitr = ((width/2)+208);
      left = e.clientX - limitl;
      
      if (e.clientX < limitl){ left = 0 }
      if (e.clientX > limitr){ left = 416 }
                                     
      $('#canon').css({'left' : left});
    });