// serve per switchare tra display block e none 
// ossia visualizzaree o nascondere l'oggetto div 'obj'
// passato come variabile
   function showhide(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;
  }
}


function toggleContent(name,n) {
	var i,t='',el = document.getElementById(name);
	if (!el.origCont) el.origCont = el.innerHTML;
	
	for (i=0;i<n;i++) t += el.origCont;
	el.innerHTML = t;
	}
	
	

function checkWordLen(obj,maxlen){
	var wordLen = maxlen; // Maximum word length
	var len = obj.value.split(/[\s]+/);
	if(len.length > wordLen){
		alert("You've exceeded the "+wordLen+" word limit for the article!");
		obj.oldValue = obj.value!=obj.oldValue?obj.value:obj.oldValue;
		obj.value = obj.oldValue?obj.oldValue:"";
		return false;
	}
	return true;
}	



<!--
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) { //v4.01
  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);
  if(!x && d.getElementById) x=d.getElementById(n); 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];}
}
//-->