$(document).ready(function() {
  function filterPath(string) {
  return string
 .replace(/^\//,'')
 .replace(/(index|default).[a-zA-Z]{3,4}$/,'')
 .replace(/\/$/,'');
  }
  var locationPath = filterPath(location.pathname);
  var scrollElem = scrollableElement('html', 'body');
  $('a[href*=#]').each(function() {
 var thisPath = filterPath(this.pathname) || locationPath;
 if (  locationPath == thisPath
 && (location.hostname == this.hostname || !this.hostname)
 && this.hash.replace(/#/,'') ) {
   var $target = $(this.hash), target = this.hash;
   if (target) {
  var targetOffset = $target.offset().top;
  $(this).click(function(event) {
    event.preventDefault();
    $(scrollElem).animate({scrollTop: targetOffset}, 400, function() {
   location.hash = target;
    });
  });
   }
 }
  });
  // use the first element that is "scrollable"
  function scrollableElement(els) {
 for (var i = 0, argLength = arguments.length; i <argLength; i++) {
   var el = arguments[i],
    $scrollElement = $(el);
   if ($scrollElement.scrollTop()> 0) {
  return el;
   } else {
  $scrollElement.scrollTop(1);
  var isScrollable = $scrollElement.scrollTop()> 0;
  $scrollElement.scrollTop(0);
  if (isScrollable) {
    return el;
  }
   }
 }
 return [];
  }
});