text: var block = document.getElementById("readEasy_block");
  
  if (block) {
    clearInterval(window.readEasyLoop);
    block.remove();
  } else {
    d = document;
    var div = d.createElement('div');
    div.id = 'readEasy_block';
    d.body.appendChild(div);
  
    var mouseY = 0;
    var follower = document.getElementById("readEasy_block");
  
    window.readEasyLoop = setInterval(function(){
      yp = mouseY + 16;
      yp = (yp < 0) ? 0 : yp;
      follower.style.top = yp + 'px';
    }, 15);
  
    document.onmousemove = function(e) {
      mouseY = e.pageY;
    }
  }
  