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

function showError(errorText)
{
	document.getElementById('errMsg').innerHTML = errorText;
}

function setInvalid(field)
{
	colorFade(field, "border", "ff0000", "b6e387", 500);
	colorFade(field, "background", "ffeeee", "ffffff", 500);
}

function setValid(field)
{
	clearInterval(field.timer);
	field.style.borderColor = "#b6e387";
	field.style.backgroundColor = "#ffffff";
}

function validate_required(field, errortxt)
{
	if (field.value == null || field.value == "")
	{
		showError(errortxt);
		setInvalid(field);
		field.focus();
		return false;
	}
	setValid(field);
	return true;
}

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;
	}
	return true;
}

function stripCharsInBag(s, bag)
{
	var i;
	var 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)
{
	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)
{
	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);
	var 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);
	}
	var month=parseInt(strMonth);
	var day=parseInt(strDay);
	var 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;
}

function validate_required_date(field, errortxt)
{
	if (field.value == null || field.value == "" || isDate(field.value) == false)
	{
		showError(errortxt);
		setInvalid(field);
		field.focus();
		return false;
	}
	setValid(field);
	return true;
}

function validate_equal(field1, field2, errortxt)
{
	if (field1.value != field2.value)
	{
		showError(errortxt);
		setInvalid(field1);
		setInvalid(field2);
		field1.focus();
		return false;
	}
	setValid(field1);
	setValid(field2);
	return true;
}

function validate_email(field, errortxt)
{
	var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	var address = field.value;
	if (reg.test(address) == false)
	{
		showError(errortxt);
		setInvalid(field);
		field.focus();
		return false;
	}
	setValid(field);
	return true;
}

function validate_bannedValue(field, bannedValue, errorText)
{
	if (field.value == bannedValue)
	{
		showError(errorText);
		setInvalid(field);
		field.focus();
		return false;
	}
	setValid(field);
	return true;
}

function validate_username(field, errorText)
{
	var reg = /^[A-Za-z0-9_-]{3,15}$/;
	var uname = field.value;
	if (reg.test(uname) == false)
	{
		showError(errorText);
		setInvalid(field);
		field.focus();
		return false;
	}
	setValid(field);
	return true;
}

function ASCIIKeyPressValue(e)
{
	var keynum;
	if (e.charCode != null)
	{
		keynum = e.charCode;
	}
	else if (e.keyCode != null)
	{
		keynum = e.keyCode;
	}
	else if (e.which != null)
	{
		keynum = e.which;
	}
	return keynum;
}

function IsMovementOrEnterKey(keynum)
{
	if (keynum == 0 || keynum == 8 || keynum == 9 || keynum == 13)
	{
		//Backspace: 8
		//Tab: 9
		//Enter: 13
		return true;
	}
	return false;
}

function formatCurrency(e)
{
	var keynum = ASCIIKeyPressValue(e);
	
	if ((keynum >= 48 && keynum <= 57) || keynum == 46) //numbers or decimal point
	{
		return true;
	}
	return IsMovementOrEnterKey(keynum);
}

function formatInt(e)
{
	var keynum = ASCIIKeyPressValue(e);
	
	if (keynum >= 48 && keynum <= 57) //numbers only
	{
		return true;
	}
	return IsMovementOrEnterKey(keynum);
}