function isDigits(str) {
	var i;

	for (i = 0; i < str.length; i++) {
		mychar = str.charAt(i);
		if (mychar < "0" || mychar > "9")
			return false;
	}
	return true;
}

function isNumber(str,required) {
	numdecs = 0;
    
  	if (required && isNull(str))
    	result = false;
	
	for (i = 0; i < str.length; i++) {
		mychar = str.charAt(i);
		if ((mychar >= "0" && mychar <= "9") || mychar == ".") {
			if (mychar == ".")
				numdecs++;
		}
		else 
			return false;
	}
	if (numdecs > 1)
		return false;
	return true;
}

function notNull(str) {
	if (str.length == 0 )
		return false;
	else 
		return true;
}

function isNull(str) {
	if (str.length == 0 )
		return true;
	else 
		return false;
}

function notBlank(str) {
	for (i = 0; i < str.length; i++) {
		if (str.charAt(i) != " ")
			return true;
	}
	return false;
}

function isSize(str, size) {
	if (str.length == size) 
		return true;
	else
		return false;
}

function isInRange(str, num1, num2) {
	var i = parseInt(str);
	return((i >= num1) && (i <= num2));
}

function isFilled(elm) { 
	if (elm.value == "" || elm.value == null) 
		return false; 
	else return true; 
} 

function stripNonDigits(str) {
	var i;
	var newstring = "";
	for (i = 0;  i < str.length; i++) {
		mychar = str.charAt(i);
		if (isDigits(mychar)) 
			newstring += mychar;
	}
	return newstring;
}

function stripChars(str, chars) {
	var i;
	var newstring = "";
	for (i = 0;  i < str.length; i++) {
		mychar = str.charAt(i);
		if (chars.indexOf(mychar) == -1)
			newstring += mychar;
	}
	return newstring;
}


function validateString(FormName, ElemName, s) {
	var myfield = document.forms[FormName].elements[ElemName];

	if (notNull(myfield.value)&& notBlank(myfield.value)) 
		return true;
	else {
		myfield.focus();
		alert("Compilare il campo " + s);
		return false;
	}
}

function validatePhone(FormName, ElemName, s) {
	var myfield = document.forms[FormName].elements[ElemName];
	var rePhone = /^[\+\d][\d\-]+\d$/;
 
	if (notNull(myfield.value) && notBlank(myfield.value)) 
	{
		// numero minimo: 2 cifre di prefisso e 5 di numero
		if (myfield.value.length > 7 && rePhone.test(myfield.value))
			return true;
	} 
	myfield.focus();
	alert("Compilare il campo " + s);
	return false;
}

function CountFilledFields(FormName, FieldName)
{
	var x       = 0;
	var HowMany = 0;

	while ((x < document.forms[FormName].elements.length))
	{
		if (document.forms[FormName].elements[x].name == FieldName)
		{
			if (document.forms[FormName].elements[x].checked != '')
				HowMany ++;
		}
		x ++;
	}
	return HowMany;
}

function CheckFilled(FormName, FieldName, s)
{
	var myfield = document.forms[FormName].elements[FieldName];

	if (CountFilledFields(FormName, FieldName) >= 1)
	{
		return true;
	}
	myfield.focus();
	alert("Compilare il campo " + s);
	return false;
}

function CheckFilledGE(FormName, FieldName, HowMany, s)
{
	var myfield = document.forms[FormName].elements[FieldName];

	if (CountFilledFields(FormName, FieldName) >= HowMany)
	{
		return true;
	}
	myfield[0].focus();
	alert("Compilare almeno " + HowMany + " scelte per il campo " + s);
	return false;
}

function CheckFilledLE(FormName, FieldName, HowMany, s)
{
	var myfield = document.forms[FormName].elements[FieldName];

	if (CountFilledFields(FormName, FieldName) <= HowMany)
	{
		return true;
	}
	myfield[0].focus();
	alert("Compilare al massimo " + HowMany + " scelte per il campo " + s);
	return false;
}

// -----------------------------------------------------------------
// Function    : IsEmailValid
// Language    : JavaScript
// Description : Checks if given email address is of valid syntax
// Copyright   : (c) 1998 Shawn Dorman
// http://www.goodnet.com/~sdorman/web/IsEmailValid.html
// -----------------------------------------------------------------
// Ver    Date    Description of modification
// --- ---------- --------------------------------------------------
// 1.0 09/04/1996 Original write
// 1.1 09/30/1998 CHG: Use standard header format
// -----------------------------------------------------------------
// Source: Webmonkey Code Library
// (http://www.hotwired.com/webmonkey/javascript/code_library/)
// -----------------------------------------------------------------

function IsEmailValid(FormName,ElemName)
{
var EmailOk  = true
var Temp     = document.forms[FormName].elements[ElemName]
var AtSym    = Temp.value.indexOf('@')
var Period   = Temp.value.lastIndexOf('.')
var Space    = Temp.value.indexOf(' ')
var Length   = Temp.value.length - 1   // Array is from 0 to length-1

if ((AtSym < 1) ||                     // '@' cannot be in first position
    (Period <= AtSym+1) ||             // Must be atleast one valid char btwn '@' and '.'
    (Period == Length ) ||             // Must be atleast one valid char after '.'
    (Space  != -1))                    // No empty spaces permitted
   {  
      EmailOk = false
      alert('Inserire una e-mail valida')
      Temp.focus()
   }
return EmailOk
}


function checkDate(FormName, ElemName) {
	var objName = document.forms[FormName].elements[ElemName];
	var datefield = objName;
	if (chkdate(objName) == false) {
		datefield.select();
		alert("Data non valida.");
		datefield.focus();
		return false;
	}
	else {
		return true;
   }
}


function chkdate(objName) {
	// var strDatestyle = "US"; //United States date style
	var strDatestyle = "EU";  //European date style
	var strDate;
	var strDateArray;
	var strDay;
	var strMonth;
	var strYear;
	var intday;
	var intMonth;
	var intYear;
	var booFound = false;
	var datefield = objName;
	var strSeparatorArray = new Array("-"," ","/",".");
	var intElementNr;
	var err = 0;
	var strMonthArray = new Array(12);
	var reDate = /^\d{2}\/\d{2}\/\d{4}$/;
	
	strMonthArray[0] = "Jan";
	strMonthArray[1] = "Feb";
	strMonthArray[2] = "Mar";
	strMonthArray[3] = "Apr";
	strMonthArray[4] = "May";
	strMonthArray[5] = "Jun";
	strMonthArray[6] = "Jul";
	strMonthArray[7] = "Aug";
	strMonthArray[8] = "Sep";
	strMonthArray[9] = "Oct";
	strMonthArray[10] = "Nov";
	strMonthArray[11] = "Dec";
	strDate = datefield.value;
	// an empty string is considered a good date
	if (strDate.length < 1) {
		return true;
	}
	if (!reDate.test(strDate) ) {
		err = 1;
		return false;
	}
	for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) {
		if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) {
			strDateArray = strDate.split(strSeparatorArray[intElementNr]);
			if (strDateArray.length != 3) {
				err = 1;
				return false;
			}
			else {
				strDay = strDateArray[0];
				strMonth = strDateArray[1];
				strYear = strDateArray[2];
			}
			booFound = true;
	   }
	}
	if (booFound == false) {
		if (strDate.length>5) {
			strDay = strDate.substr(0, 2);
			strMonth = strDate.substr(2, 2);
			strYear = strDate.substr(4);
		}
	}
	if (strYear.length == 2) {
		strYear = '20' + strYear;
	}
	// US style
	if (strDatestyle == "US") {
		strTemp = strDay;
		strDay = strMonth;
		strMonth = strTemp;
	}
	intday = parseInt(strDay, 10);
	if (isNaN(intday)) {
		err = 2;
		return false;
	}
	intMonth = parseInt(strMonth, 10);
	if (isNaN(intMonth)) {
		for (i = 0;i<12;i++) {
			if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase()) {
				intMonth = i+1;
				strMonth = strMonthArray[i];
				i = 12;
			}
		}
		if (isNaN(intMonth)) {
			err = 3;
			return false;
		}
	}
	intYear = parseInt(strYear, 10);
	if (isNaN(intYear)) {
		err = 4;
		return false;
	}
	if (intMonth>12 || intMonth<1) {
		err = 5;
		return false;
	}
	if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1)) {
		err = 6;
		return false;
	}
	if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1)) {
		err = 7;
		return false;
	}
	if (intMonth == 2) {
		if (intday < 1) {
			err = 8;
			return false;
		}
		if (LeapYear(intYear) == true) {
			if (intday > 29) {
				err = 9;
				return false;
			}
		}
		else {
			if (intday > 28) {
				err = 10;
				return false;
			}
		}
	}
	// if (strDatestyle == "US") {
	// 	datefield.value = strMonthArray[intMonth-1] + " " + intday+" " + strYear;
	// }
	// else {
	// 	datefield.value = intday + " " + strMonthArray[intMonth-1] + " " + strYear;
	// }
	return true;
}

function LeapYear(intYear) {
	if (intYear % 100 == 0) {
		if (intYear % 400 == 0) { return true; }
	}
	else {
		if ((intYear % 4) == 0) { return true; }
	}
	return false;
}

function doDateCheck(from, to) {
	if (Date.parse(from.value) <= Date.parse(to.value)) {
		alert("The dates are valid.");
	}
	else {
		if (from.value == "" || to.value == "") 
			alert("Both dates must be entered.");
		else 
			alert("To date must occur after the from date.");
   }
}

function confirmPwd(FormName, ElemName, ElemName2) {
	var first_pwd_field = document.forms[FormName].elements[ElemName];
	var second_pwd_field = document.forms[FormName].elements[ElemName2];

	if (first_pwd_field.value == second_pwd_field.value) 
		return true;
	else {
		first_pwd_field.value = "";
		second_pwd_field.value = "";
		first_pwd_field.focus();
		alert("Errore nella conferma della password.");
		return false;
	}
}