function vp(id)
{
	var elmt = document.getElementById(id);
  if (elmt.className == "p0")
  {
    elmt.className = "p1";
  }
  else
  {
    elmt.className = "p0";
  }
}

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