jQuery.easing.quart = function (x, t, b, c, d) {
    return -c * ((t=t/d-1)*t*t*t - 1) + b;
};

$(function () {
	$('.link_to_top').click(function () {
		$(this).blur();
		$('html,body').animate({ scrollTop: 0 }, 1000, 'quart');
		return false;
	});
});