window.addEvent('domready',function() {
  /* smooth */


  /* scrollspy instance */
  var ss = new ScrollSpy({
    min: 251,
    onEnter: function(position,state,enters) {
      $('floating_head').setStyle('display','block');
      $('table_wrapper').setStyle('background','none');
    },
    onLeave: function(position,state,leaves) {
      $('floating_head').setStyle('display','none');
      $('table_wrapper').setStyle('background','url(features_files/feature_banner.png) no-repeat top center');
    },
    container: window
  });
});