var head="display:''"
img1=new Image()
img1.src="../immagini/fold.gif"
img2=new Image()
img2.src="../immagini/open.gif"

var ns6=document.getElementById&&!document.all
var ie4=document.all&&navigator.userAgent.indexOf("Opera")==-1

function checkcontained(e)
{
var iscontained=0
cur=ns6? e.target : event.srcElement
i=0
if (cur.id=="foldheader")
iscontained=1
else
while (ns6&&cur.parentNode||(ie4&&cur.parentElement))
{
if (cur.id=="foldheader"||cur.id=="foldinglist")
{
iscontained=(cur.id=="foldheader")? 1 : 0
break
}
cur=ns6? cur.parentNode : cur.parentElement
}

if (iscontained)
{
   var foldercontent=ns6? cur.nextSibling.nextSibling : cur.all.tags("UL")[0]
   if (foldercontent.style.display=="none")
  {
     foldercontent.style.display=""
     cur.style.listStyleImage="url(../immagini/open.gif)"
   }else{ 
     foldercontent.style.display="none"
     cur.style.listStyleImage="url(../immagini/fold.gif)"
   }
}
}

if (ie4||ns6)
document.onclick=checkcontained