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$(function () {

  var top = 0,
    step = 55,
    viewport = $(window).height(),
    body = $.browser.webkit ? $('body') : $('html'),
    wheel = false;

  $('body').mousewheel(function(event, delta) {

    wheel = true;

    if (delta < 0) {

        top = (top+viewport) >= $(document).height() ? top : top+=step;

        body.stop().animate({scrollTop: top}, 400, function () {
            wheel = false;
        });
    } else {
      top = top <= 0 ? 0 : top-=step;

      body.stop().animate({scrollTop: top}, 400, function () {
          wheel = false;
      });
    }

    return false;
  });

  $(window).on('resize', function (e) {
      viewport = $(this).height();
  });

  $(window).on('scroll', function (e) {
      if (!wheel)
          top = $(this).scrollTop();
  });

});