// http://www.drweb.de/magazin/animiertes-scrollen-mit-jquery/#top
function enable_smooth_scroll() {

    function filterPath(string) {
        return string
                .replace(/^\//,'')
                .replace(/(index|default).[a-zA-Z]{3,4}$/,'')
                .replace(/\/$/,'');
    }

    var locationPath = filterPath(location.pathname);

    var scrollElement = 'html, body';
    $('html, body').each(function () {
        var initScrollTop = $(this).attr('scrollTop');
        $(this).attr('scrollTop', initScrollTop + 1);
        if ($(this).attr('scrollTop') == initScrollTop + 1) {
            scrollElement = this.nodeName.toLowerCase();
            $(this).attr('scrollTop', initScrollTop);
            return false;
        }
    });

    $('a[href*=#]').each(function() {
        var thisPath = filterPath(this.pathname) || locationPath;
        if(locationPath == thisPath && (location.hostname == this.hostname || !this.hostname) && this.hash.replace(/#/, '') ) {
	        if($(this.hash).length) {
	          $(this).click(function(event) {
	            var targetOffset = $(this.hash).offset().top;
	            var target = this.hash;
	            event.preventDefault();
	            $(scrollElement).animate( {scrollTop: targetOffset}, 500, function() { location.hash = target; });
	         	});
	        }
        }
    });
}