Animated scroll plus hash in url

animate_hash.js

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() {
	// 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}, 400, function() {
						// Set hash in URL after animation successful
						location.hash = target;
					});
				});
			}
	}
});