function HideContent(d) {
  if(d.length < 1) { return; }
  document.getElementById(d).style.display = "none";
}
function ShowContent(d) {
  if(d.length < 1) { return; }
  document.getElementById(d).style.display = "block";
}
function ReverseContentDisplay(d) {
  if(d.length < 1) { return; }
  if(document.getElementById(d).style.display == "none") { 
    document.getElementById(d).style.display = "block"; 
    document.getElementById(d+"img").src = "PHP/events/implode.png"; 
   }
  else { 
    document.getElementById(d).style.display = "none"; 
    document.getElementById(d+"img").src = "PHP/events/explode.png"; 
  }
}