function getRefToDiv(divID) {
        return document.getElementById(divID);
}

function showDiv(divID_as_a_string) {
    //get a reference as above ...
    myReference = getRefToDiv(divID_as_a_string);
    if ( myReference.style.display == 'block' ) {
        myReference.style.display = 'none';
    } else {
        myReference.style.display = 'block';
    }
}

function showThanks() {
  myReference = getRefToDiv('thanksList');
  if (myReference.style.display == 'block') {
    myReference.style.display = 'none';
  } else {
    myReference.style.display = 'block';
  }
}

function showSpoiler(block) {
   // by The Small One
   block.nextSibling.nextSibling.style.display ="block";
   block.parentNode.removeChild(block);
}