function displayToggle(id) {
  var el = document.getElementById(id).style; 
  if(el.display == "none") {
  el.display = "block";  
  }
  else if(el.display == "block") {
  el.display = "none";
}
}

function visibilityToggle(id) {
  var el = document.getElementById(id).style;
  if(el.visibility == "hidden") {
  el.visibility = "visible";  
  }
  else if(el.visibility == "visible") {
  el.visibility = "hidden";
}
}

function showHide(id,vis) {
 document.getElementById(id).style.visibility=vis;
}

function showDisplay(id,display) {
 document.getElementById(id).style.display=display;
}