$(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;
	
							});
						});
					}
			}
	
		});
	
		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 [];
		}
	
	});