var digits = "0123456789";
var lowercaseLetters = "abcdefghijklmnopqrstuvwxyz"
var uppercaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

// whitespace characters
var whitespace = " \t\n\r"

// decimal point character differs by language and culture
var decimalPointDelimiter = "."

// m is an abbreviation for "missing"
var mPrefix = "Valore non inserito per "
var mSuffix = "\nQuesto campo e' obbligatorio"
var defaultEmptyOK = false

// Check whether string s is empty.

function isEmpty(s)
{   
return ((s == null) || (s.length == 0))
}

function charInString(c, s) {
	return (s.indexOf(c) != -1);
}


// Returns true if string s is empty or 
// whitespace characters only.

function isWhitespace (s)

{   var i;

    // Is s empty?
    if (isEmpty(s)) return true;

    // Search through string's characters one by one
    // until we find a non-whitespace character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);

        if (whitespace.indexOf(c) == -1) return false;
    }

    // All characters are whitespace.
    return true;
}

// Removes initial (leading) whitespace characters from s.
// Global variable whitespace (see above)
// defines which characters are considered whitespace.

function stripInitialWhitespace (s)

{   var i = 0;

    while ((i < s.length) && charInString (s.charAt(i), whitespace))
       i++;
    
    return s.substring (i, s.length);
}

function stripInitialZeroes (s)

{   var i = 0;

    while ((i < s.length) && charInString (s.charAt(i), " 0"))
       i++;
    
    return s.substring (i, s.length);
}


// Returns true if character c is an English letter 
// (A .. Z, a..z).
//
// NOTE: Need i18n version to support European characters.
// This could be tricky due to different character
// sets and orderings for various languages and platforms.

function isLetter (c)
{   return ( ((c >= "a") && (c <= "z")) || ((c >= "A") && (c <= "Z")) )
}



// Returns true if character c is a digit 
// (0 .. 9).

function isDigit (c)
{   
return ((c >= "0") && (c <= "9"))
}



// Returns true if character c is a letter or digit.

function isLetterOrDigit (c)
{   return (isLetter(c) || isDigit(c))
}

// EXAMPLE FUNCTION CALL:     RESULT:
// isInteger ("5")            true 
// isInteger ("")             defaultEmptyOK
// isInteger ("-5")           false
// isInteger ("", true)       true
// isInteger ("", false)      false
// isInteger ("5", false)     true

function isPosInteger (s, codeLenght, defaultEmpty)
{   
	var i = 0;

   	if (isPosInteger.arguments.length == 3) {
	    if (isEmpty(s) && defaultEmpty) return true;
	}
    if (isEmpty(s)) return false;
    // if (isPosInteger.arguments.length == 1) return false;
    // else return (isPosInteger.arguments[1] == true);

   	if (isPosInteger.arguments.length >= 2) {
	    if ((s.length < codeLenght)||(s.length > codeLenght)) return false
	}


    // Search through string's characters one by one
    // until we find a non-numeric character.
    // When we do, return false; if we don't, return true.
    
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (!isDigit(c)) return false;
    }
    
    if (i==0) return false;

    // All characters are numbers.
    return true;
}


function isAlphabetic (s, codeLenght, defaultEmpty)
{   
    var i;

   	if (isAlphabetic.arguments.length == 3) {

		if (isEmpty(s) && defaultEmpty) return true;
	}
	
	 s = stripInitialWhitespace (s);
     if (isAlphabetic.arguments.length >= 2) {
	    if ((s.length < codeLenght) || (s.length > codeLenght)) return false
	 }

    // Search through string's characters one by one
    // until we find a non-alphabetic character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is letter.
        var c = s.charAt(i);

        if (!isLetter(c))
        return false;
    }

    // All characters are letters.
    return true;
}


function isAlphanumeric (s)

{   var i;

    if (isEmpty(s)) 
       if (isAlphanumeric.arguments.length == 1) return defaultEmptyOK;
       else return (isAlphanumeric.arguments[1] == true);

    // Search through string's characters one by one
    // until we find a non-alphanumeric character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number or letter.
        var c = s.charAt(i);

        if (! (isLetter(c) || isDigit(c) ) )
        return false;
    }

    // All characters are numbers or letters.
    return true;
}

// isEmail (STRING s [, BOOLEAN emptyOK])
// 
// Email address must be of form a@b.c -- in other words:
// * there must be at least one character before the @
// * there must be at least one character before and after the .
// * the characters @ and . are both required
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.

function isEmail (s)
{   

	if (isEmpty(s)) return false;
//	if (isEmail.arguments.length == 1) return defaultEmptyOK;
//       else return (isEmail.arguments[1] == true);
   
    // is s whitespace?
    if (isWhitespace(s)) return false;
    
    // there must be >= 1 character before @, so we
    // start looking at character position 1 
    // (i.e. second character)
    var i = 1;
    var sLength = s.length;

    // look for @
    while ((i < sLength) && (s.charAt(i) != "@"))
    { i++
    }

    if ((i >= sLength) || (s.charAt(i) != "@")) return false;
    else i += 2;

    // look for .
    while ((i < sLength) && (s.charAt(i) != "."))
    { i++
    }

    // there must be at least one character after the .
    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
    else return true;
}


// Display prompt string s in status bar.

function prompt (s)
{   window.status = s
}

// Notify user that required field theField is empty.
// String s describes expected contents of theField.value.
// Put focus in theField and return false.

function warnEmpty (theField, s)
{   theField.focus()
    RequiredField(s)
    return false
}

function RequiredField (s)
{   
    alert(mPrefix + s + mSuffix);
}


// Notify user that contents of field theField are invalid.
// String s describes expected contents of theField.value.
// Put select theField, pu focus in it, and return false.

function warnInvalid (theField, s)
{   theField.focus()
    theField.select()
    alert(s)
    return false
}


function checkString (theField, s, emptyOK)
{   // Next line is needed on NN3 to avoid "undefined is not a number" error
    // in equality comparison below.
    if (checkString.arguments.length == 2) emptyOK = defaultEmptyOK;
// -    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
// -   if (isWhitespace(theField.value)) 
// -      return warnEmpty (theField, s);
	 inputStr = stripInitialWhitespace(theField.value.toString());
	 
    if ((inputStr == "") || (inputStr.length == 0))
	 return warnEmpty (theField, s);
    else return true;
}

function checkInteger (theField, s , emptyOK)
{   
  // Next line is needed on NN3 to avoid "undefined is not a number" error
    // in equality comparison below.
    if (checkInteger.arguments.length == 2) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    if (!isPosInteger(theField.value)) {
	 	return warnInvalid (theField, s);
	 }
    else return true;
}


function checkRange (theField, s, bottom, top)
{       
    if (!isIntegerInRange(theField.value, bottom, top))
	 	return warnInvalid (theField, s);
	
	 return true;
}


// checkEmail (TEXTFIELD theField [, BOOLEAN emptyOK==false])
//
// Check that string theField.value is a valid Email.
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.

function checkEmail (theField, emptyOK)
{   if (checkEmail.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    else if (!isEmail(theField.value, false)) 
       return warnInvalid (theField, iEmail);
    else return true;
}


// Get checked value from radio button.

function getRadioButtonValue (radio)
{   for (var i = 0; i < radio.length; i++)
    {   if (radio[i].checked) { break }
    }
    return radio[i].value
}

function getSelectListValue (option)
{   for (var i = 0; i < option.length; i++)
    {   if (option[i].selected) { break }
    }
    return option[i].value.toString()
}


function checkFlag (checkbox)
{   
    return (checkbox.checked);
}


function isIntegerInRange (s, a, b)
{   
	if (isEmpty(s)) 
       if (isIntegerInRange.arguments.length == 1) return defaultEmptyOK;
		 else return false;
       //else return (isIntegerInRange.arguments[1] == true);

    
	 // Catch non-integer strings to avoid creating a NaN below,
    // which isn't available on JavaScript 1.0 for Windows.
    if (!isPosInteger(s)) return false;

    // Now, explicitly change the type to integer via parseInt
    // so that the comparison code below will work both on 
    // JavaScript 1.2 (which typechecks in equality comparisons)
    // and JavaScript 1.1 and before (which doesn't).
    var num = parseInt (s);
    return ((num >= a) && (num <= b));
}



function SubmitMyForm( TargetForm, ActionUrlPath )
{
        TargetForm.actions.value = ActionUrlPath;
        TargetForm.submit();
}
function DeleteButton( TargetForm,Actions )
{
        if( confirm('Are you sure ?'))
        {
                TargetForm.actions.value = Actions;
                TargetForm.submit();
                return true;
        }
        else
        {
                return false;
        }
}
function Cancel( ObjectWindow )
{
                history.go(-1);
}
function Redirect( Action,Target )
{
        Target.location = Action;
}

function currYear() {
	today = new Date()
	var curr_year = today.getYear();
	if (curr_year < 100) {
		curr_year = 1900 + curr_year;
	}
	return curr_year;
}


function show_props(obj, obj_name) {
   var result = ""
   for (var i in obj)
      result += obj_name + "." + i + " = " + obj[i] + "\n"
   return result
}

var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	if (isEmpty(dtStr)) {
		return false;
	}
 
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		//alert("The date format should be : dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Please enter a valid date")
		return false
	}
	return true
}