function closeTopTree()
{
  for(i=0;i<topTreeTable.cells.length/2;i++)
  {
    topTreeTable.cells[2*i+1].innerHTML="";
	treeImg[i].src="20020403/list.gif";
  }
}

function openTopTree(n)
{
  if(topTreeTable.cells[2*n+1].innerHTML=="")
  {
    closeTopTree();
	treeImg[n].src="20020403/list2.gif";
	switch(n)
	{
	  case 0 : {topTreeTable.cells[2*n+1].innerHTML=item00_all;break;}
	  case 1 : {topTreeTable.cells[2*n+1].innerHTML=item01_all;break;}
	  case 2 : {topTreeTable.cells[2*n+1].innerHTML=item02_all;break;}
	}
  }
  else
    closeTopTree();
}