function expandnode(node)
{
  if(document.getElementById('node'+node+'children').style.display=="none")
  {
    document.getElementById('node'+node+'children').style.display="block";
    document.getElementById('expand'+node).innerHTML='<a href="javascript:expandnode('+node+')"><img src="/images/parent_tree_minus.jpg" /></a>';
  }
  else
  {
    document.getElementById('node'+node+'children').style.display="none";
    document.getElementById('expand'+node).innerHTML='<a href="javascript:expandnode('+node+')"><img src="/images/parent_tree_plus.jpg" /></a>';
  }
}

function expandparent(node)
{
  var parent=document.getElementById('node'+node+'parent').value;
  if(parent!="0")
  {
        document.getElementById('node'+parent+'children').style.display="block";
        document.getElementById('expand'+parent).innerHTML='<a href="javascript:expandnode('+parent+')"><img src="/images/parent_tree_minus.jpg" /></a>';
        expandparent(parent);
  }
}