// http://css-tricks.com/snippets/jquery/smooth-scrolling/

$(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');

	// Any links with hash tags in them (can't do ^= because of fully qualified URL potential)
	$('a[href*=#]').each(function() {

			// Ensure it's a same-page link
			var thisPath = filterPath(this.pathname) || locationPath;
			if (  locationPath == thisPath
					&& (location.hostname == this.hostname || !this.hostname)
					&& this.hash.replace(/#/,'') ) {

							// Ensure target exists
							var $target = $(this.hash), target = this.hash;
							if (target) {

									// Find location of target
									var targetOffset = $target.offset().top;
									$(this).click(function(event) {

											// Prevent jump-down
											event.preventDefault();

											// Animate to target
											$(scrollElem).animate({scrollTop: targetOffset}, 1200, 'easeInOutExpo', function() {

													// Set hash in URL after animation successful
													//location.hash = target;

											});
									});
							}
			}

	});

	// Use the first element that is "scrollable"  (cross-browser fix?)
	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 [];
	}

});