$(document).ready(function() {
			  function filterPath(string) {
			  return string
			    .replace(/^\//,'')
			    .replace(/(index|default).[a-zA-Z]{3,4}$/,'')
			    .replace(/\/$/,'');
			  }
			  var locationPath = filterPath(location.pathname);
			  var scrollElem = scrollableElement('html', 'body');
			  var topMargin = 20;
			  $('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 - topMargin;
			        
			        $(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 [];
			  }
			
			});