/**************************************************************
IsEmail: Returns a Boolean if the specified Expression is a
          valid e-mail address. If Expression is null, false
          is returned.

Parameters:
      Expression = e-mail to validate.

Returns: Boolean
***************************************************************/
function IsEmail(Expression)
{
	if (Expression == null)
		return (false);

	var supported = 0;
	if (window.RegExp)
	{
		var tempStr = "a";
		var tempReg = new RegExp(tempStr);
		if (tempReg.test(tempStr)) supported = 1;
	}
	if (!supported)
		return (Expression.indexOf(".") > 2) && (Expression.indexOf("@") > 0);
	var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
	return (!r1.test(Expression) && r2.test(Expression));
}


function Mid(String, Start, Length)
{
	if (String == null)
		return (false);

	if (Start > String.length)
		return '';

	if (Length == null || Length.length == 0)
		return (false);

	return String.substr((Start - 1), Length);
}

function InStr(String1, String2)
{
	var a = 0;

	if (String1 == null || String2 == null)
		return (false);

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

	a = String1.indexOf(String2);
	if (a == -1)
		return 0;
	else
		return a + 1;
}

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 ('');
}

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 ('');
}

function Trim(String)
{
	if (String == null)
		return (false);

	return RTrim(LTrim(String));
}

function IsNumber(Expression)
{
	Expression = Expression.toLowerCase();
	RefString = "0123456789.-";

	if (Expression.length < 1) 
		return (false);

	for (var i = 0; i < Expression.length; i++) 
	{
		var ch = Expression.substr(i, 1)
		var a = RefString.indexOf(ch, 0)
		if (a == -1)
			return (false);
	}
	return(true);
}



function FormatCurrency(Expression){

	var iNumDecimals = 2;
	var dbInVal = Expression.replace(",",".");
	var bNegative = false;
	var iInVal = 0;
	var strInVal
	var strWhole = "", strDec = "";
	var strTemp = "", strOut = "";
	var strValue = "";
	var iLen = 0;

	if (dbInVal < 0)
	{
		bNegative = true;
		dbInVal *= -1;
	}

	dbInVal = dbInVal * Math.pow(10, iNumDecimals)
	iInVal = parseInt(dbInVal);
	if ((dbInVal - iInVal) >= .5)
	{
		iInVal++;
	}
	strInVal = iInVal + "";
	strWhole = strInVal.substring(0, (strInVal.length - iNumDecimals));
	strDec = strInVal.substring((strInVal.length - iNumDecimals), strInVal.length);
	while (strDec.length < iNumDecimals)
	{
		strDec = "0" + strDec;
	}
	iLen = strWhole.length;
	if (iLen >= 3)
	{
		while (iLen > 0)
		{
			strTemp = strWhole.substring(iLen - 3, iLen);
			if (strTemp.length == 3)
			{
				strOut = "," + strTemp + strOut;
				iLen -= 3;
			}
			else
			{
				strOut = strTemp + strOut;
				iLen = 0;
			}
		}
		if (strOut.substring(0, 1) == ",")
		{
			strWhole = strOut.substring(1, strOut.length);
		}
		else
		{
			strWhole = strOut;
		}
	}
	
	strWhole = strWhole.replace(",",".");
	
	if (bNegative)
	{
		strValue =  "-" + strWhole + "," + strDec;
	}
	else
	{
		 strValue = strWhole + "," + strDec;
	}

	return strValue;
}



function validar_numero() {

	if ((event.keyCode<48 || event.keyCode>57 ) && (event.keyCode!=13)) {

		//keyCode = 44 é a virgula
		//keyCode = 46 é o ponto
		//if (event.keyCode != 44 && event.keyCode != 46)event.keyCode=0;
		if (event.keyCode != 44) event.keyCode=0;
	}		
}


function IsDate(dateStr)
{
	// Checks for the following valid date formats:
	// DD/MM/YYYY   DD-MM-YYYY

	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)
	{
		var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))
		if (day>29 || (day==29 && !isleap))
			return false;
	}
	return true;
}