// whitespace characters
var whitespace = " \t\n\r";
var defaultEmptyOK = false;
var whitespaceHTML = "<P>&nbsp;</P>";



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


function VacioHTML(s)
{  
	return ((s == whitespaceHTML))
	
}

function esFichero()
/*	Devuelve true si el Fichero tiene la extensión que se pasa como parámetro
	 Devuelve false en cualquier otro caso */
{
	var cadena,res,extensiones,i;
	
	extensiones = esFichero.arguments;
	cadena = extensiones[0];
	cadena = cadena.toUpperCase();
	res = false;
	for (i=1;i < extensiones.length; i++)
	{ 
		if (cadena.indexOf("."+ extensiones[i]) != -1 )
		{
			res = true;		
		}
	}
	return (res);
}

function Fecha(dateStr)
{
// Checks for the following valid date formats:
// MM/DD/YY   MM/DD/YYYY   MM-DD-YY   MM-DD-YYYY
// Also separates date into month, day, and year variables

var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/;

// To require a 4 digit year entry, use this line instead:
// var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;

var matchArray = dateStr.match(datePat); // is the format ok?
if (matchArray == null) {
alert("La fecha no está en un formato válido.")
return false;
}
month = matchArray[3]; // parse date into variables
day = matchArray[1];
year = matchArray[4];
if (month < 1 || month > 12) { // check month range
alert("El mes debe estar entre 1 y 12.");
return false;
}
if (day < 1 || day > 31) {
alert("El día debe estar entre 1 y 31.");
return false;
}
if ((month==4 || month==6 || month==9 || month==11) && day==31) {
alert("El mes "+month+" no tiene 31 dias!")
return false
}
if (month == 2) { // check for february 29th
var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
if (day>29 || (day==29 && !isleap)) {
alert("Febrero de " + year + " no tiene " + day + " dias!");
return false;
   }
}
return true;  // date is valid
}

function compararFechas(dateStr1,dateStr2)
{
// Checks for the following valid date formats:
// MM/DD/YY   MM/DD/YYYY   MM-DD-YY   MM-DD-YYYY
// Also separates date into month, day, and year variables

var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/;

// To require a 4 digit year entry, use this line instead:
// var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;

var matchArray1 = dateStr1.match(datePat); // is the format ok?
if (matchArray1 == null) {
alert("La fecha no está en un formato válido.")
return false;
}
month1 = matchArray1[3]; // parse date into variables
day1 = matchArray1[1];
year1 = matchArray1[4];

var matchArray2 = dateStr2.match(datePat); // is the format ok?
if (matchArray2 == null) {
alert("La fecha no está en un formato válido.")
return false;
}
month2 = matchArray2[3]; // parse date into variables
day2 = matchArray2[1];
year2 = matchArray2[4];


if (month1 >= 10)
{
	month1 = month1 - 5;
	month2 = month2 - 5;
}
if (month2 >= 10)
{
	month1 = month1 - 5;
	month2 = month2 - 5;
}
if (day1 >= 10)
{
	day1 = day1 - 31;
	day2 = day2 - 31;
}
if (day2 >= 10)
{
	day1 = day1 - 31;
	day2 = day2 - 31;
}



if (year1 > year2) 
{
	
	return false; 
}
else
{
	if (year1 == year2)
	{
		if (month1 > month2)
		{
			
			return false;
		}
		else
		{
			if (month1 == month2)
			{
				if (day1 > day2)
				{
					
					return false;
					
				}
				
				
				
			}
			
			
		}
	}
	
	
}

//alert ("sin errores")
return true;  // date is valid
}


/****************************************************************/

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

function EnBlanco(s)

{   var i;

    // Is s empty?
    if (Vacio(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;
}

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

function EnBlancoHTML(s)

{   var i;

    // Is s empty?
    if (VacioHTML(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.

     
    i = 0;
    while (i < s.length)
    {   
		// Check that current character isn't whitespace.
		var c = s.charAt(i);
	
		if (c == "&")
			if (s.substring(i,i+6)!="&nbsp;") return false;
			else 
			{	i = i+6;
			}
		else
			if (c == "<")
				if (s.substring(i,i+3)!="<P>" && s.substring(i,i+4)!="</P>")
				{ return false;
				}
				else
					if (s.substring(i,i+3)=="<P>") {
						i = i+3;
					}
					else {
						i = i+4;
					}
			else{
				if (whitespace.indexOf(c)== -1)
					return false;
				i = i+1;
				}
			
    }
  
    // All characters are whitespace.
    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 Email(s)
{   if (Vacio(s)) 
       if (Email.arguments.length == 1) return defaultEmptyOK;
       else return (Email.arguments[1] == true);
   
    // is s whitespace?
    if (EnBlanco(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;
}

function NIF(strNif)
{
	var arrLetra = new Array('T','R','W','A','G','M','Y','F','P','D','X','B','N','J','Z','S','Q','V','H','L','C','K','E');

	if (strNif.length < 9) return false;
	
	
	var n = strNif.substring(0, 8);
	if (Number(n) == NaN) return false;
		 
	var l = strNif.substring(8, 9);
	var letra = l.charCodeAt(0);
	if (!(letra >= 65 && letra <= 90)) return false;
	var position =Number(n)%23;
	if (arrLetra[position] != l) return false;
	
	return true;
}

function LongMax(objField, nLength, strWarning)
{
	var strField = new String(objField.value);

	if (strField.length > nLength) {
		alert(strWarning);
		return false;
	} else
		return true;
}

function LongMin(strField, nLength)
{
	if (strField.length < nLength) {
		return false;
	} else 
		return true;
}



function digito(valor){
   numero=parseInt(valor);
   if (!(numero>=0 && numero<=9)){
	alert("Introduzca un número entre 0 y 9");
	return(false);
   }
   return(true);
}
function Rango(valor,min,min){
   numero=parseInt(valor);
   if (!(numero>=min && numero<=min)){
	alert("Introduzca un número entre " + min+ " y " + max);
	return(false);
   }
   return(true);
}
function numero(valor){
   nume=parseInt(valor);
   if ((nume != valor)){
	//alert("Introduzca un número"); 
	return(false);
   }
   return(true);
}

function Requerido(objField, FieldName)
{
	var strField = new String(objField.value);
	if (EnBlanco(strField)) {
		alert("Debe introducir " + FieldName);
		objField.focus();
		objField.select();
		return false;
	}

	return true;
}


function numeroreal(valor){
   var nume = parseFloat(valor);
   if ((nume != valor)){
	return(false);
   }
   return(true);
}


function ConvertComa(objTxt){
   var strCadena = objTxt.value;
   objTxt.value = strCadena.replace(/,/g,".");
}

function ErasePunto(objCampo){
   var strCadena = objCampo.value;
   objCampo.value = strCadena.replace(/\./g,"");
}

function EraseBlank(objCampo){
   var strCadena = objCampo.value;
   objCampo.value = LTrim(RTrim(strCadena));
}

function ConvToUpper(objCampo){
	objCampo.value = objCampo.value.toUpperCase();
}

function RTrim(strTrim)
{
	var str = new String(strTrim);
	var i = 0;
	var c = "";
	var endpos = 0;
	
	if (EnBlanco(str)){
		return "";
	}
	else{
		for (i = str.length - 1; i >= 0 && endpos == 0; i = i - 1) {
			c = str.charAt(i);
			if (whitespace.indexOf(c) == -1)
				endpos = i;
		}

		return str.substring(0,endpos+1);
	}
}

function LTrim(strTrim)
{
	var str = new String(strTrim);
	var i = 0;
	var c = "";
	var pos = 0;

	if (EnBlanco(str)){
		return "";
	}
	else{
		for (i = 0; i <= str.length - 1; i = i + 1) {
			c = str.charAt(i);
			if (whitespace.indexOf(c) == -1){
				pos = i;
				break;
			}
		}
		return str.substring(pos,str.length);
	}
}

function Trim(strTrim){
	var str = new String(strTrim);
	if(EnBlanco(str))	return "";
	else{
		strTrim = RTrim(strTrim);
		strTrim = RTrim(strTrim);
		return strTrim;
	}
}