function ntbr() {
  var nt = document.querySelectorAll('.netto-price');
  var br = document.querySelectorAll('.brutto-price');
                                                        
    nt.forEach(function(price) {
            price.style.display = price.style.display === 'none' ? 'inline-block' : 'none';
    });

    br.forEach(function(price) {
            price.style.display = price.style.display === 'inline-block' ? 'none' : 'inline-block';
    });  
}

/* for the mobile view menu */
document.addEventListener("DOMContentLoaded", function() {
    var lastScrollTop = 0;
    var ntbrDiv = document.querySelector('div:has(>.ntbr)');

    window.addEventListener('scroll', function(event) {
     if (window.innerWidth < 992) {
        var currentScrollTop = window.pageYOffset || document.documentElement.scrollTop;

        if (currentScrollTop > lastScrollTop) {
            // Scrolling down
            ntbrDiv.style.top = "25px";
        } else {
            // Scrolling up
            ntbrDiv.style.top = "75px";
        }

        // Update last scroll position
        lastScrollTop = currentScrollTop;
      }
    });
});