function dda() {

   let threshold = 1;

  let upElem = document.createElement('img');
  upElem.src = 'https://ar.mqalat.nl/wp-content/uploads/2023/10/medo.png';
  upElem.style.width = '30px';
  upElem.style.height = '30px'; 
  upElem.style.position = 'fixed';
  upElem.style.bottom = '10px';
  upElem.style.right = '10px';
  upElem.style.cursor = 'pointer';
  upElem.style.display = 'none';
  upElem.style.backgroundColor = '#999'; 
  upElem.style.zIndex = '9999999';





  upElem.onerror = function() {
    this.textContent = 'UP'; 
  }

  document.body.appendChild(upElem);

  window.onscroll = function() {
    if (window.pageYOffset > threshold) {
      upElem.style.display = 'block';
    } else {
      upElem.style.display = 'none';
    }
  }

  upElem.onclick = function() {
    window.scrollTo(0, 0);
  }

}

dda();