function inverseshowelement (PElementID)
{
  var ElementID = document.getElementById(PElementID);
  if (!ElementID) return;
  ElementID.style.display = (ElementID.style.display == "none") ? "block" : "none";
}

function hideelement (PElementID)
{
  var ElementID = document.getElementById(PElementID);
  if (!ElementID) return;
  ElementID.style.display = "none";
}

function showelement (PElementID)
{
  var ElementID = document.getElementById(PElementID);
  if (!ElementID) return;
  ElementID.style.display = "block";
}

function checkAll(form) 
{
  for( i = 0, n = form.elements.length; i < n; i++ ) 
  {
    if( form.elements[i].type == "checkbox" ) 
    {
      //if( form.elements[i].checked == true )
      //  form.elements[i].checked = false;
      //else
      form.elements[i].checked = true;
    }
  }
}