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 = '#programmalijst'; //'html, body';
	$('#programmalijst').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;
		}
	});
    
    $('#alfabet a[href*=#]').each(function() {
        var thisPath = filterPath(this.pathname) || locationPath;
        if  (   locationPath == thisPath
                && (location.hostname == this.hostname || !this.hostname)
                && this.hash.replace(/#/, '')
            ) {
                if ($(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;
                        });
                    });
                }
        }
    });
}