// JavaScript Document
// resize fix for ns4
var origWidth, origHeight;
if (document.layers) {
	origWidth = window.innerWidth; origHeight = window.innerHeight;
	window.onresize = function() { if (window.innerWidth != origWidth || window.innerHeight != origHeight) history.go(0); }
}

// link style change
var cur_link;
function doLinkClass(lnk) {
  if (lnk && lnk.blur) lnk.blur();	// remove marquee
  if (!lnk || cur_link == lnk) return;
  if (cur_link) cur_link.className = "done";
  lnk.className = "on";
  cur_link = lnk;
}

var cur_lyr;	// holds id of currently visible layer
function swapLayers(lnk,id) {
  doLinkClass(lnk);
  if (cur_lyr) hideLayer(cur_lyr);
  showLayer(id);
  cur_lyr = id;
}

function showLayer(id) {
  var lyr = getElemRefs(id);
  if (lyr && lyr.css) lyr.css.visibility = "visible";
}

function hideLayer(id) {
  var lyr = getElemRefs(id);
  if (lyr && lyr.css) lyr.css.visibility = "hidden";
}

function getElemRefs(id) {
	var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? getLyrRef(id,document): null;
	if (el) el.css = (el.style)? el.style: el;
	return el;
}

// get reference to nested layer for ns4
function getLyrRef(lyr,doc) {
	if (document.layers) {
		var theLyr;
		for (var i=0; i<doc.layers.length; i++) {
	  	theLyr = doc.layers[i];
			if (theLyr.name == lyr) return theLyr;
			else if (theLyr.document.layers.length > 0) 
	    	if ((theLyr = getLyrRef(lyr,theLyr.document)) != null)
					return theLyr;
	  }
		return null;
  }
}

function init(id,lyr) {
  var lnk = getElemRefs(id);
  swapLayers(lnk,lyr);
}

//Inizio funzione contatore caratteri nella textarea

var ns6=document.getElementById&&!document.all

function restrictinput(maxlength,e,placeholder){
	if (window.event&&event.srcElement.value.length>=maxlength)
		return false
	else if (e.target&&e.target==eval(placeholder)&&e.target.value.length>=maxlength){
		var pressedkey=/[a-zA-Z0-9\.\,\/]/ //detect alphanumeric keys
		if (pressedkey.test(String.fromCharCode(e.which)))
			e.stopPropagation()
	}
}

function countlimit(maxlength,e,placeholder){
	var theform=eval(placeholder)
	var lengthleft=maxlength-theform.value.length
	var placeholderobj=document.all? document.all[placeholder] : document.getElementById(placeholder)
	if (window.event||e.target&&e.target==eval(placeholder)){
		if (lengthleft<0)
			theform.value=theform.value.substring(0,maxlength)
			placeholderobj.innerHTML=lengthleft
	}
}

function displaylimit(thename, theid, thelimit){
	var theform=theid!=""? document.getElementById(theid) : thename
	var limit_text='Caratteri rimanenti: <span id="'+theform.toString()+'">'+thelimit+'</span> '
	if (document.all||ns6)
		document.write(limit_text)
		if (document.all){
			eval(theform).onkeypress=function(){ return restrictinput(thelimit,event,theform)}
			eval(theform).onkeyup=function(){ countlimit(thelimit,event,theform)}
		}
		else if (ns6){
			document.body.addEventListener('keypress', function(event) { restrictinput(thelimit,event,theform) }, true); 
			document.body.addEventListener('keyup', function(event) { countlimit(thelimit,event,theform) }, true); 
}
}