function expandTree(folderObj)
{
  var childObj;
  var i;
  if (!folderObj.isOpen)
    clickOnNodeObj(folderObj)
  for (i=0 ; i < folderObj.nChildren; i++)
  {
    childObj = folderObj.children[ i ]
    if (typeof childObj.setState != "undefined")
    {
      expandTree(childObj)
    }
  }
  window.status = 'Operazione completata';
}

function collapseTree()
{ 
  scrollTo(0,0);
  clickOnNodeObj(foldersTree);
  clickOnNodeObj(foldersTree);
  window.status = 'Operazione completata';
}