Anchor Link Navigation

Good day. There is some code for smooth animation on anchor links. But there is a navigation header, which is located on all other pages of the site. There is an error in my code, because the id value is passed as "index.php # id", but it is necessary that the top variable contains the id value equal to "#id". Please help remove the value of "index.php" in the variable. Without anchor links with "index.php" links from other pages will not work. At once I will make a reservation, I use an insert in php, therefore such crutches. Or leave the main page with your header, and on all pages create your own code for the header))) But I think that you will help to solve it more beautifully. thank

// плавная прокрутна до нажатого пункта меню $("nav li").on("click",".nav_a", function (event) { // исключаем стандартную реакцию браузера event.preventDefault(); // получем идентификатор блока из атрибута href var id = $(this).attr('href'); // находим высоту, на которой расположен блок console.log(id); var top = $(id).offset().top-60; // анимируем переход к блоку, время: 800 мс $('body,html').animate({scrollTop: top}, 800); });