function popup (file)
{
  var dati = 'toolbar=no,status=no,location=no,menubar=no,scrollbars=yes,width=500,height=350,'+center_window(500,350);
  window.open (file, 'popap', dati);
}

function center_window (w, h)
{
  var left = Math.round (screen.availWidth / 2) - Math.round (w / 2);
  var top = Math.round (screen.availHeight / 2) - Math.round (h / 2);
  return 'left='+left+',top='+top;
}

function on(nos)
{
  if (document.images) {document[nos].src = eval(nos + "on.src"); }
}

function off(nos)
{
  if (document.images) {document[nos].src = eval(nos + "off.src");}
}

function goBookmark (f)
{
  window.location = "#" + f;
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v3.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}