String.prototype.trim = function()
{
    return this.replace(/(^\s*)|(\s*$)/g, "");
}



 
function VerificaEmail(obj) 
{
	var validChars, err01,err02, err03, err04, fieldValue, fieldLength;
	var cont = 0, cont2 = 0;
	var Limpar = false;
	
	validChars  = "abcdefghijklmnopqrstuvwxyz"; 
	validChars += "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 
	validChars += "0123456789.@_-";
	fieldValue  = obj.value; 
	fieldLength = obj.value.length; 
	minLength   = 8; 
	maxLength   = 255; 

	err01   = "Foi encontrado um caracter inválido."; 
	err02   = "Por favor introduza pelo menos " + minLength + " caracteres."; 
	err03   = "Por favor introduza menos que " + maxLength + " caracteres."; 
 
	if ( fieldLength > 0)
	{
		if ( fieldLength < minLength ) 
		{ 
			alert( err02 ); 
			Limpar = true;
		}
		else if (( fieldLength > maxLength ) && ( maxLength > 0 )) 
		{ 
			alert( err03 ); 
			Limpar = true;
		}
		else if (( fieldValue.charAt( 0 ) == "@" ) || ( fieldValue.charAt( fieldLength - 1 ) == "@" )) 
		{
			alert("O Email não é válido !!!"); 
			Limpar = true;
		}
		else 
		{ 
			for( var i=0; i< fieldLength; i++ ) 
			{ 
				if ( validChars.indexOf( fieldValue.charAt( i )) == -1 ) 
				{ 
				    alert( err01 ); 
				    Limpar = true;
				    break; 
				}
				if (fieldValue.charAt( i ) == "@")
					cont++;
				if (fieldValue.charAt( i ) == ".")
					cont2++;
		    } 
			    
		    if (cont2 == 0 )
			{
				alert("O Email não é válido !!!"); 
				Limpar = true;
			}
			else if ( (cont == 0) || (cont > 1) )
		    {
				alert("O Email não é válido !!!"); 
				Limpar = true;		
			}
		} 
    } 
    if(Limpar) obj.focus(); 
}


browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

ns3up = (browserName == "Netscape" && browserVer >= 3);
ie4up = (browserName.indexOf("Microsoft") >= 0 && browserVer >= 4);



if (ie4up)
{
//script from www.argnet.tk
 function blockError(){return true;}
 window.onerror = blockError;
 
 function disableselect(e)
 {
    return false
 }
 function reEnable()
 {
    return true
 }
 //if IE4+
 document.onselectstart=new Function ("return false")
 //if NS6
 if (window.sidebar)
 {
    document.onmousedown=disableselect
    document.onclick=reEnable
 }
}

 
 
function doPic(imgName) 
{
if (ns3up || ie4up) 
{
imgOn = ("../Database/Images/BarcosUsados/" + imgName);
document.mainpic.src = imgOn;
slowhigh(mainpic);
}
}

var baseopacity=20

function slowhigh(which2){
imgobj=which2
browserdetect=which2.filters? "ie" : typeof which2.style.MozOpacity=="string"? "mozilla" : ""
instantset(baseopacity)
highlighting=setInterval("gradualfade(imgobj)",200)
}

function slowlow(which2){
cleartimer()
instantset(baseopacity)
}

function instantset(degree){
if (browserdetect=="mozilla")
imgobj.style.MozOpacity=degree/100
else if (browserdetect=="ie")
imgobj.filters.alpha.opacity=degree
}

function cleartimer(){
if (window.highlighting) clearInterval(highlighting)
}

function gradualfade(cur2){
if (browserdetect=="mozilla" && cur2.style.MozOpacity<1)
cur2.style.MozOpacity=Math.min(parseFloat(cur2.style.MozOpacity)+0.1, 0.99)
else if (browserdetect=="ie" && cur2.filters.alpha.opacity<100)
cur2.filters.alpha.opacity+=5
else if (window.highlighting)
clearInterval(highlighting)
}


function VerificaFone(valor, theForm, nome)
{
				//Validar Ficheiro
				var checkOK = "-() 0123456789";
				var checkStr = valor;
				var allValid = true;
				var decPoints = 0;
				var allNum = "";
				for (i = 0;  i < checkStr.length;  i++)
				{
				  ch = checkStr.charAt(i);
				  for (j = 0;  j < checkOK.length;  j++)
				    if (ch == checkOK.charAt(j))
				      break;
				  if (j == checkOK.length)
				  {
				    allValid = false;
				    break;
				  }
				  allNum += ch;
				}
				if (!allValid)
				{
				  alert("Neste campo apenas são permitidos números, \"-\", \"()\".");
				  theForm[nome].focus();
				  return(false);
				}
			

}

//Função para validar datas
<!-- Begin
function checkdate(objName) {
var datefield = objName;
if (chkdate(objName) == false) {
datefield.select();
alert("A data é inválida.  Por favor, tente novamente.");
datefield.focus();
return false;
}
else {
return true;
   }
}
function chkdate(objName) {
var strDatestyle = "BR"; 
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;

strDate = datefield.value;
if (strDate.length < 1) {
return true;
}
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)) 
{

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;
}
}
}
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)) {
return true;
}
else {
if (from.value == "" || to.value == "") 
{
alert("As duas datas devem ser digitadas.");
return false;

}
else 
{
alert("A data final deve ser maior que a data de início.");
return false;

}
}
}