Effect.LazyScrollTo = function(element) { try {
  var options = arguments[1] || { };
  scrollOffsets = document.viewport.getScrollOffsets();
  elementOffsets = $(element).cumulativeOffset();

  if (options.offset) elementOffsets[1] += options.offset;

  return new Effect.Tween(null,
    scrollOffsets.top,
    elementOffsets[1],
    options,
    function(p){
      try {
        this.lazy_offset = this.lazy_offset || $(element).cumulativeOffset();
        scrollTo(scrollOffsets.left, (p.round() - (elementOffsets[1] - this.lazy_offset[1])));
      } catch(e) {
        alert(e);
      }
    }.bind(this)
  );
} catch(e) { alert(e); }}

new Effect.SlideDown('tab1-body', {queue: 'end'});
new Effect.LazyScrollTo('tab1-heading', {queue: 'end'});