function show( element )
{
  hideall();
  document.getElementById('portfoliodefault').style.visibility = "hidden";
  document.getElementById(element).style.visibility = "visible";
}

function hide( element )
{
  document.getElementById(element).style.visibility = "hidden";
  document.getElementById('portfoliodefault').style.visibility = "visible";
}

function hideall( )
{
  document.getElementById('pftcentral').style.visibility = "hidden";
  document.getElementById('whitehillfarm').style.visibility = "hidden";
  document.getElementById('pazazz').style.visibility = "hidden";
  document.getElementById('eke').style.visibility = "hidden";
}