function confirm_action(displ_text){   //pede confirmacao da accao que se vai realizar
	msg="";
	if(displ_text != ""){
		msg = displ_text + "\n";
	}
    msg = msg + "Por favor, confirme que quer continuar.";
    return confirm(msg);
}
    
   
function popup(url,nome,width,height,scroll){ /*FUNCION PARA ABRIR UN POPUP*/
 var w=width;
 var h=height;
 window.open (url,nome,'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars='+scroll+',resizable=yes,top=100,left=100,width='+w+',height='+h+'')
}

function deleteReg() {
	var x = window.confirm('Tem a certeza que QUER APAGAR os registos selecionados?');
	if( x ) {
		document.form.DELETE.value = 'true';
		document.form.submit();
	}
}

/*************FCs de validacao para FORMS*****************/
/** Email Validation ******************************************/
function isValidEmail(emailStr, warning) {	
	/* The following variable tells the rest of the function whether or not
	to verify that the address ends in a two-letter country or well-known
	TLD.  1 means check it, 0 means don't. */
	var checkTLD=1;
	
	/* The following is the list of known TLDs that an e-mail address must end with. */
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	
	/* The following pattern is used to check if the entered e-mail address
	fits the user@domain format.  It also is used to separate the username
	from the domain. */
	var emailPat=/^(.+)@(.+)$/;
	
	/* The following string represents the pattern for matching all special
	characters.  We don't want to allow special characters in the address. 
	These characters include ( ) < > @ , ; : \ " . [ ] */
	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
	
	/* The following string represents the range of characters allowed in a 
	username or domainname.  It really states which chars aren't allowed.*/
	var validChars="\[^\\s" + specialChars + "\]";
	
	/* The following pattern applies if the "user" is a quoted string (in
	which case, there are no rules about which characters are allowed
	and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
	is a legal e-mail address. */
	var quotedUser="(\"[^\"]*\")";
	
	/* The following pattern applies for domains that are IP addresses,
	rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
	e-mail address. NOTE: The square brackets are required. */
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	
	/* The following string represents an atom (basically a series of non-special characters.) */
	var atom=validChars + '+';
	
	/* The following string represents one word in the typical username.
	For example, in john.doe@somewhere.com, john and doe are words.
	Basically, a word is either an atom or quoted string. */
	var word="(" + atom + "|" + quotedUser + ")";
	
	// The following pattern describes the structure of the user
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	
	/* The following pattern describes the structure of a normal symbolic
	domain, as opposed to ipDomainPat, shown above. */
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	
	/* Finally, let's start trying to figure out if the supplied address is valid. */
	
	/* Begin with the coarse pattern to simply break up user@domain into
	different pieces that are easy to analyze. */
	var matchArray=emailStr.match(emailPat);
	if (matchArray==null) {
		/* Too many/few @'s or something; basically, this address doesn't
		even fit the general mould of a valid e-mail address. */
		if (warning == true) alert("O email não parece ser válido (verifique os @ e .'s)");
		return false;
	}
	
	var user=matchArray[1];
	var domain=matchArray[2];
	
	// Start by checking that only basic ASCII characters are in the strings (0-127).
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			if (warning == true) alert("O username tem caracteres inválidos.");
			return false;
		}
	}
	
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			if (warning == true) alert("O domínio tem caracteres inválidos.");
			return false;
		}
	}
	
	// See if "user" is valid 
	if (user.match(userPat)==null) {// user is not valid
		if (warning == true) alert("O username não parece ser válido.");
		return false;
	}
	
	/* if the e-mail address is at an IP address (as opposed to a symbolic
	host name) make sure the IP address is valid. */

	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {// this is an IP address
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				if (warning == true) alert("IP do destino é inválido.");
				return false;
			}
		}
		return true;
	}
	
	// Domain is symbolic name.  Check if it's valid.
	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
			if (warning == true) alert("O domínio não parece ser válido.");
			return false;
		}
	}
	
	/* domain name seems valid, but now make sure that it ends in a
	known top-level domain (like com, edu, gov) or a two-letter word,
	representing country (uk, nl), and that there's a hostname preceding 
	the domain or country. */
	if (checkTLD && domArr[domArr.length-1].length!=2 && 
	domArr[domArr.length-1].search(knownDomsPat)==-1) {
		if (warning == true) alert("O endereço deve terminar com um domínio conhecido ou com duas letras representativas de um país.");
		return false;
	}
	
	// Make sure there's a host name preceding the domain.
	if (len<2) {
		if (warning == true) alert("Falta um host ao domínio escrito");
		return false;
	}
	
	// If we've gotten this far, everything's valid!
	return true;
}

function verify_data(value2check, text2display){   //Verifica se o campos passado esta' vazio e nesse caso, avisa
	if(value2check==""){
		alert("Campo sem dados. " + text2display);
		return false;
      	}
	else
		return true;
}

/************* validacao onKeyPress dos campos ******************/
function KeyCheckNum(myfield,e){ //Verifica se os dados inseridos estao ente 1-0 //KeyCode=0 -> delete
	var keycode;
	if (window.event) 
		keycode = window.event.keyCode;
	else if (e) 
		keycode = e.which;
	else 
		return true;
	if (((keycode>47) && (keycode<58)) || (keycode==8) || (keycode==9) || (keycode==11) || (keycode==0) )
		return true;
	else 
		alert("O dígito inserido não é válido.\nApenas são permitidos os dígitos de 0 a 9.");
	return false;
}

function KeyCheckDate(myfield,e){ //Verifica se os dados inseridos estao ente 1-0 //KeyCode=0 -> delete //=45-> traco
	var keycode;
	if (window.event) 
		keycode = window.event.keyCode;
	else if (e) 
		keycode = e.which;
	else 
		return true;
		
	if (((keycode>47) && (keycode<58)) || (keycode==8) || (keycode==9) || (keycode==11) || (keycode==0) || (keycode==45))
		return true;
	else 
		alert("O dígito inserido não é válido.\nApenas são permitidos os dígitos de 0 a 9 e '-'.");
	return false;
}

function KeyCheckPhone(myfield,e){ //Verifica se os dados inseridos estao ente 1-0, (, ), space, +. //KeyCode=0 -> delete // 43=+, 40=(, 41=)
	var keycode;
	if (window.event) 
		keycode = window.event.keyCode;
	else if (e) 
		keycode = e.which;
	else 
		return true;
	if(keycode==43)
		if (getFreq(myfield.value, "+")>0){
			alert("Não pode repetir o indicador '+'.");
			return false;
		}
	if(keycode==40)
		if (getFreq(myfield.value, "(")>0){
			alert("Não pode repetir a abertura de prefixo internacional '('.");
			return false;
		}
	if(keycode==41)
		if (getFreq(myfield.value, ")")>0){
			alert("Não pode repetir o fecho de prefixo internacional ')'.");
			return false;
		}
	if(keycode==32)
		if (getFreq(myfield.value, " ")>0){
			alert("Não pode repetir o espaço entre o prefixo internacional e o nº telefone.");
			return false;
		}	
	if (((keycode>47) && (keycode<58)) || (keycode==8) || (keycode==9) || (keycode==11) || (keycode==0) || (keycode==43) || (keycode==40) || (keycode==41) || (keycode==32))
		return true;
	else 
		alert("O caracter inserido não é válido.\nApenas são permitidos os dígitos de 0 a 9, e/ou o indicativo do país.");
				
	return false;
}


/**************************************************************
 getFreq: Returns a Long specifying the nr of times a one string within occurs inside another. If String1 or String2 are null, 0 is returned.
 Parameters:
      String1 = String expression being searched.
      String2 = String expression sought
 Returns: Integer >= 0
***************************************************************/
function getFreq(String1, String2){
	if (String1 == null || String1 == "" || String2 == null || String2 == "")
		return 0;

	String1 = String1.toLowerCase();
	String2 = String2.toLowerCase();

	var a = String1.split(String2);

	return a.length -1;
}


function isValidName(defaultName){   //Verifica se os campos seleccionados estao vazios e nesse caso, avisa
	var nome = Trim(document.forms[0].varNome.value)
	if(nome=="" || nome==defaultName){
		alert("O Nome do registo não está preenchido.");
		document.forms[0].varNome.focus();
		return false;
      	}
	return true;
}



/**************************************************************
 LTrim: Returns a String containing a copy of a specified string without leading spaces 
 Parameters:
      String = The required string argument is any valid string expression. If string contains null, false is returned
 Returns: String
***************************************************************/
function LTrim(String){
	var i = 0;
	var j = String.length - 1;

	if (String == null)
		return (false);

	for (i = 0; i < String.length; i++)	{
		if (String.substr(i, 1) != ' ' &&
		    String.substr(i, 1) != '\t')
			break;
	}

	if (i <= j)
		return (String.substr(i, (j+1)-i));
	else
		return ('');
}

/**************************************************************
 RTrim: Returns a String containing a copy of a specified string without trailing spaces 
 Parameters:
      String = The required string argument is any valid string expression. If string contains null,  false is returned
 Returns: String
***************************************************************/
function RTrim(String){
	var i = 0;
	var j = String.length - 1;
	if (String == null)
		return (false);

	for(j = String.length - 1; j >= 0; j--)	{
		if (String.substr(j, 1) != ' ' &&
			String.substr(j, 1) != '\t')
		break;
	}
	if (i <= j)
		return (String.substr(i, (j+1)-i));
	else
		return ('');
}

/**************************************************************
 RTrim: Returns a String containing a copy of a specified string without both leading and trailing spaces 
 Parameters:
      String = The required string argument is any valid string expression. If string contains null, false is returned
 Returns: String
***************************************************************/
function Trim(String){
	if (String == null)
		return (false);
	return RTrim(LTrim(String));
}

/**************************************************************
 roundNumber: Arredonda um nr, X casas decimais
 Parameters:
      decLength = the number of decimals to round
      myNumber = nr to round
 Returns: Rounded Nr
***************************************************************/
function roundNumber(decLength, myNumber) {
	if (decLength==null || isNaN(decLength))
		decLength = 0;
	return Math.round(myNumber*Math.pow(10,decLength))/Math.pow(10,decLength);
}

/****************************
 allDigits
****************************/
function allDigits(str){
	return inValidCharSet(str,"0123456789");
}

/****************************
 inValidCharSet
****************************/
function inValidCharSet(str,charset){
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0){
			result = false;
			break;
		}
	
	return result;
}

/****************************
 isValidDate
****************************/
function isValidDate(dateValue){
	var result = true;

  	if (result){
 		var elems = dateValue.split("-");
 		
 		result = (elems.length == 3); // should be three components
 		
 		if (result){
  			var day = parseInt(elems[0],10);
 			var month = parseInt(elems[1],10);
 			var year = parseInt(elems[2],10);
 			
			result = allDigits(elems[1]) && (day > 0) && (day < 32) &&
			            allDigits(elems[0]) && (month > 0) && (month < 13) &&
			            allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
 		}
	} 
	
	return result;
}

/**************************************************************
 IsDate: Returns a Boolean (true) if the date is true, false if not
 Parameters:
	- DateStr: String date in format (DD/MM/YYYY or DD-MM-YYYY)
 Returns: Boolean
***************************************************************/
function isDate(dateStr){
	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;

	var matchArray = dateStr.match(datePat)
	if (matchArray == null)
		return false;

	day = matchArray[1]
	month = matchArray[3]
	year = matchArray[4]
	
	if (month < 1 || month > 12)
		return false;

	if (day < 1 || day > 31)
		return false;	
		
	if ((month==4 || month==6 || month==9 || month==11) && day==31)
		return false;

	if (month == 2)
		if (day>29 || (day==29 && !isLeapYear(year)))
			return false;
	return true;
}


/**************************************************************
Verificação do CÓDIGO POSTAL
NNNN-NNN
***************************************************************/
function isCodePst(dateStr){
	var datePat = /^(\d{4})(\/|-)(\d{3})$/;

	var matchArray = dateStr.match(datePat)
	if (matchArray == null)
		return false;
	/*
	quatro = matchArray[1]
	tres = matchArray[5]
	
	if (tres == "")
		tres = '-000';
		return false;
	*/
	return true;
}

/**************************************************************
 LeapYear: Return a Boolean if the speficied Year is a Leap Year
 Parameters:
      Year = Numeric expression that represents the Year.
 Returns: Boolean
***************************************************************/
function isLeapYear(Year){    
	return (Year % 4 == 0 && Year % 100 != 0 || Year % 400 ==0);
}

/**************************************************************
 isValidTime
***************************************************************/
function isValidTime(timeValue){
	var result = true;
	var elems = timeValue.split(":");
 	result = (elems.length == 2); // should be three components
	if (result){
		var hour = parseInt(elems[0],10);
		var minutes = parseInt(elems[1],10);
		result = allDigits(elems[0]) && (hour > 0) && (hour < 25) &&
		            allDigits(elems[1]) && (minutes >= 0) && (minutes < 60) ;
 	} 
	return result;
}


/**************************************************************
makeDate: formato DD-MM-AAAA; nao verifica pois assume
q já verificou a validade de data
***************************************************************/
function makeDate(dateValue){
	var result = true;
	var myDate = new Date();
	

 	var elems = dateValue.split("-");
 		 		
 	if (result){
 		var day = parseInt(elems[0],10);
 		var month = parseInt(elems[1],10);
 		var year = parseInt(elems[2],10);
 		
 		myDate.setDate(day);
 		myDate.setMonth(month-1);
 		myDate.setYear(year);

 	}
	
	return myDate;
}

/*******************************
Função para comparar duas datas
********************************/
function compareDates (value1, value2) {
   var date1, date2;
   var month1, month2;
   var year1, year2;

   date1 = value1.substring (0, value1.indexOf ("-"));
   month1 = value1.substring (value1.indexOf ("-")+1, value1.lastIndexOf ("-"));
   year1 = value1.substring (value1.lastIndexOf ("-")+1, value1.length);

   date2 = value2.substring (0, value2.indexOf ("-"));
   month2 = value2.substring (value2.indexOf ("-")+1, value2.lastIndexOf ("-"));
   year2 = value2.substring (value2.lastIndexOf ("-")+1, value2.length);

   if (year1 > year2) return 1;
   else if (year1 < year2) return -1;
   else if (month1 > month2) return 1;
   else if (month1 < month2) return -1;
   else if (date1 > date2) return 1;
   else if (date1 < date2) return -1;
   else return 0;
} 


/*******************************
Função para inverter as escolhas das checkbox
<input type="checkbox" onclick="invertAll(this, this.form, 'disciplina[]');">
********************************/
function invertAll(headerfield, checkform, mask){
	for (var i = 0; i < checkform.length; i++)
	{
		if (typeof(checkform[i].name) == "undefined" || (typeof(mask) != "undefined" && checkform[i].name.substr(0, mask.length) != mask))
			continue;
		if (!checkform[i].disabled)
			checkform[i].checked = headerfield.checked;
	}
}

/***********
Original:  Cyanide_7 (leo7278@hotmail.com
Web Site:  http://members.xoom.com/cyanide_7

The JavaScript Source!! http://javascript.internet.com
************/

var isNN = (navigator.appName.indexOf("Netscape")!=-1);
function autoTab(input,len, e) {
	var keyCode = (isNN) ? e.which : e.keyCode; 
	var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];
	if(input.value.length >= len && !containsElement(filter,keyCode)) {
		input.value = input.value.slice(0, len);
		input.form[(getIndex(input)+1) % input.form.length].focus();
	}
	function containsElement(arr, ele) {
		var found = false, index = 0;
		while(!found && index < arr.length)
			if(arr[index] == ele)
				found = true;
			else
				index++;
		return found;
	}
	function getIndex(input) {
		var index = -1, i = 0, found = false;
		while (i < input.form.length && index == -1)
			if (input.form[i] == input)index = i;
			else i++;
		return index;
	}
	return true;
}


/**
Funcao para mostrar um grupo de divs
*********/
function switchid(id){	
	hideallids();
	showdiv(id);
}
function hideallids(){
	//loop through the array and hide each element by id
	for (var i=0;i<ids.length;i++){
		hidediv(ids[i]);
	}		  
}
function hidediv(id) {
	//safe function to hide an element with a specified id
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'none';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'none';
		}
		else { // IE 4
			document.all.id.style.display = 'none';
		}
	}
}
function showdiv(id) {
	//safe function to show an element with a specified id		  
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'block';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'block';
		}
		else { // IE 4
			document.all.id.style.display = 'block';
		}
	}
}
function toggle(id){
	if (document.getElementById) { // DOM3 = IE5, NS6
		if (document.getElementById(id).style.display == 'block'){
			document.getElementById(id).style.display = 'none';
		} else {
			document.getElementById(id).style.display = 'block';
		}
	}
	else {
		if (document.layers) { // Netscape 4
			if (document.id.display == 'block'){
				document.id.display = 'none';
			} else {
				document.id.display = 'block';
			}
		}
		else { // IE 4
			if (document.all.id.style.display == 'block'){
				document.all.id.style.display = 'none';
			} else {
				document.all.id.style.display = 'block';
			}
		}
	}
}