text: function openArticle(evt, aB) {
    var i, tabcontent;
  
    tabcontent = document.getElementsByClassName("tabcontent");
    for (i = 0; i < tabcontent.length; i++) {
      tabcontent[i].style.display = "none";
    }
    
    document.getElementById(aB).style.display = "block";
    evt.currentTarget.className += " active";
  }
  