// serve per switchare tra display block e none 
// ossia visualizzaree o nascondere l'oggetto div 'obj'
// passato come variabile
   function showhideSimple(obj)
	{
      if (document.getElementById(obj).style.display=='block') {
            // fai .....
		document.getElementById(obj).style.display='none';		
      } else {
            // fai .....
		document.getElementById(obj).style.display='block';		
      }
    }

<!-- finestra popup generica con variabili centrata -->
function popup_generica (url,wname,w,h,scroll,browserloc,menubar,resizable,status,directories,toolbar) {
	var winl = (screen.width - w) / 2 - 5;
	var wint = (screen.height - h) / 2 -80;
	finestra = window.open(url,wname,'top='+wint+',left='+winl+',width='+w+',height='+h+',buttons=1,scrollbars='+scroll+',location='+browserloc+',menubar='+menubar+',resizable='+resizable+',status='+status+',directories='+directories+',toolbar='+toolbar+',copyhistory=Yes');
}

<!-- script per aggiugnere ai preferiti-->
function addBookmark(title,url) {
  if (window.sidebar)
  {
    window.sidebar.addPanel(title, url,"");
  }
  else if( document.all )
  {
    window.external.AddFavorite( url, title);
  }
  else
  {
    return true;
  }
}



// funzione per il fade dell immagine in testata

function initImage() {
  imageId = 'thephoto';
  image = document.getElementById(imageId);
  setOpacity(image, 0);
  image.style.visibility = 'visible';
  fadeIn(imageId,0);
}

function setOpacity(obj, opacity) {
  opacity = (opacity == 100)?99.999:opacity;
  
  // IE/Win
  obj.style.filter = "alpha(opacity:"+opacity+")";
  
  // Safari<1.2, Konqueror
  obj.style.KHTMLOpacity = opacity/100;
  
  // Older Mozilla and Firefox
  obj.style.MozOpacity = opacity/100;
  
  // Safari 1.2, newer Firefox and Mozilla, CSS3
  obj.style.opacity = opacity/100;
}

function fadeIn(objId,opacity) {
  if (document.getElementById) {
    obj = document.getElementById(objId);
    if (opacity <= 100) {
      setOpacity(obj, opacity);
      opacity += 10;
      window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 100);
    }
  }
}
// previene il caricamento 
document.write("<style type='text/css'> #thephoto {visibility:hidden;} </style>");