var isNav4, isNav6, isIE, lastPage;
var coll = "";
var styleObj = "";
var preloadFlag = false;
var menuflag = false;

// browser detection
if (parseInt(navigator.appVersion) >= 4) {
	if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) == 4) {
		isNav4 = true;
	} else {
		if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) > 4) {
			isNav6 = true;
			styleObj = ".style";
		} else {
			isIE = true;
			coll = "all.";
			styleObj = ".style";
		}
	}
}

//bugfix for Netscape 4
function WM_netscapeCssFix() {
  /*
    Source: Webmonkey Code Library
    (http://www.hotwired.com/webmonkey/javascript/code_library/)

    Author: Taylor
    Author Email: taylor@wired.com
    Author URL: http://www.taylor.org/
    */

  // This part was inspired by Matthew_Baird@wayfarer.com
  // It gets around another unfortunate bug whereby Netscape fires a resize event when the scrollbars pop up. This  checks to make sure that the window's available size has actually changed.
  if (document.WM.WM_netscapeCssFix.initWindowWidth != window.innerWidth || document.WM.WM_netscapeCssFix.initWindowHeight != window.innerHeight) {
    document.location = document.location;
  }
}

function WM_netscapeCssFixCheckIn() {
  // This function checks to make sure the version of Netscap in use contains the bug; if so, it records the window's width and height and sets all resize events to be handled by the WM_netscapeCssFix() function.
  if ((navigator.appName == 'Netscape') && (parseInt(navigator.appVersion) == 4)) {
    if (typeof document.WM == 'undefined'){
      document.WM = new Object;
    }
    if (typeof document.WM.WM_scaleFont == 'undefined') {
      document.WM.WM_netscapeCssFix = new Object;
      document.WM.WM_netscapeCssFix.initWindowWidth = window.innerWidth;
      document.WM.WM_netscapeCssFix.initWindowHeight = window.innerHeight;
    }
    window.onresize = WM_netscapeCssFix;
  }
}

WM_netscapeCssFixCheckIn()

function didaLayer(theLayer) {
	// find out where we are
	var fname = location.pathname
	var lastSlash = fname.lastIndexOf("/", fname.length);
	var daPage = fname.substring(lastSlash+1, fname.length);
	if (daPage == 'index.jsp' || daPage == undefined || daPage == '') {
		var didaList = new Array ("didachisiamo", "didafrancobolli", "didamateriali", "didarichieste", "didalink");
	} else {
		var didaList = new Array ("didachisiamo", "didafrancobolli", "didamateriali", "didarichieste", "didalink", "didaemail", "didahome");
	}
	for (var i = 0; i < didaList.length; i++) {
		if (theLayer == 'off') { // mouseOut
			layerOff(didaList[i]); // turn all layers off
		} else { //mouseOver
			if (i == theLayer) {
				if (i == 0) {
					if (!menuflag) {
						layerOn(didaList[i]);
						//menuflag = true;
					}
				} else {
					if (menuflag) {
						layerOff("menuchisiamo");
						layerOff("menufrancobolli");
						menuflag = false;
					}
					layerOn(didaList[i]);
				}
			} else {
				layerOff(didaList[i]);
			}
		}
	}
}

// returns valid object reference
function getObject(obj) {
	var theObj;
	if (isNav4) {
		theObj = eval("document." + obj);
	} else {
		if (isNav6) {
			theObj = eval("document.getElementById(" + "\"" + obj + "\"" + ")" + styleObj);
		} else {
			theObj = eval("document." + coll + obj + styleObj);
		}
	}
	return theObj;
}

// Utility function makes layer visible
function layerOn(obj) {
	var theObj = getObject(obj);
	theObj.visibility = "visible";
	window.status='';
}

// Utility function makes layer invisible
function layerOff(obj) {
	var theObj = getObject(obj);
	theObj.visibility = "hidden";
	window.status='';
}

// Utility function makes layer visible
function openchimenu() {
	if (!menuflag) {
		layerOn('menuchisiamo');
		layerOff('didachisiamo');
		menuflag = true;
	} else {
		layerOff('menuchisiamo');
		layerOn('didachisiamo');
		menuflag = false;
	}
}

// Utility function makes layer visible
function openframenu() {
	if (!menuflag) {
		layerOn('menufrancobolli');
		layerOff('didafrancobolli');
		menuflag = true;
	} else {
		layerOff('menufrancobolli');
		layerOn('didafrancobolli');
		menuflag = false;
	}
}

function gopag(thepage) {
	layerOff('menuchisiamo');
	layerOff('menufrancobolli');
	menuflag = false;
	document.location.href = thepage;
}

function goTop() {
	if (navigator.appName == "Netscape") {
		top.scrollTo(0,0);
	} else {
		top.document.body.scrollTop = 0;
	}
}

// apre finestra del trattamento dei dati
function apridati() {
	win=window.open("dati.htm","dati","toolbar=0,status=0,directories=0,scrollbars=1,location=0,resizable=0 menubar=0,width=400,height=500")
}