function fold(blockid)
{
  var block=document.getElementById("gfb"+blockid);
  var image=document.getElementById("gfi"+blockid);
  var anchor=document.getElementById("gfa"+blockid);
  if (block==null)
  {
    return;
  }
  block.style.display="none";
  image.src="system/galp.gif";
  anchor.href="javascript:unfold("+blockid+")";
}
function unfold(blockid)
{
  var block=document.getElementById("gfb"+blockid);
  var image=document.getElementById("gfi"+blockid);
  var anchor=document.getElementById("gfa"+blockid);
  if (block==null)
  {
    return;
  }
  block.style.display="block";
  image.src="system/galm.gif";
  anchor.href="javascript:fold("+blockid+")";
}