function setHeight(divName, newHeight)
{
  document.getElementById (divName).style.height = newHeight;
}

function show(divName)
{
  document.getElementById (divName).style.visibility = "visible";
}

function hide(divName)
{
  document.getElementById (divName).style.visibility = "hidden";
}

function hideParent(divName)
{
  document.getElementById (divName).parentNode.style.visibility = "hidden";
}

function block(divName)
{
  document.getElementById (divName).style.display = "block";
}
function blockParent(divName)
{
  document.getElementById (divName).parentNode.style.display = "block";
}

function unblock(divName)
{
  document.getElementById (divName).style.display = "none";
}
function unblockParent(divName)
{
  document.getElementById (divName).parentNode.style.display = "none";
}