var isNav4 = false, isNav5 = false, isIE4 = false
var strSeperator = "/"; 
//var vDateType = 3; // Global value for type of date format
//                3 = dd/mm/yyyy hh:mm
//var vDateType = 4; // Global value for type of date format
//                4 = dd/mm/yyyy hh:mm
var vYearType = 4; //Set to 2 or 4 for number of digits in the year for Netscape
var vYearLength = 4; // Set to 4 if you want to force the user to enter 4 digits for the year before validating.
var err = 0; // Set the error code to a default of zero
if(navigator.appName == "Netscape") 
{
	if (navigator.appVersion < "5") 
	{
		isNav4 = true;
		isNav5 = false;
	}
	else
		if (navigator.appVersion > "4") 
		{
			isNav4 = false;
			isNav5 = true;
    	}
}
else 
{
	isIE4 = true;
}
function DateFormat(vDateName, vDateValue, e, dateCheck, dateType) 
{
vDateType = dateType;
if (vDateValue == "~") 
{
	alert("AppVersion = "+navigator.appVersion+" \nNav. 4 Version = "+isNav4+" \nNav. 5 Version = "+isNav5+" \nIE Version = "+isIE4+" \nYear Type = "+vYearType+" \nDate Type = "+vDateType+" \nSeparator = "+strSeperator);
	vDateName.value = "";
	vDateName.focus();
	return true;
}
var whichCode = (window.Event) ? e.which : e.keyCode;
if (vDateValue.length > 8 && isNav4) 
{
	if ((vDateValue.indexOf("-") >= 1) || (vDateValue.indexOf("/") >= 1))
		return true;
}
var alphaCheck = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/-";
if (alphaCheck.indexOf(vDateValue) >= 1) 
{
	if (isNav4) 
	{
		vDateName.value = "";
		vDateName.focus();	
		vDateName.select();
		return false;
	}
	else 
	{
		vDateName.value = vDateName.value.substr(0, (vDateValue.length-1));
		return false;
	}
}
if (whichCode == 8) //Ignore the Netscape value for backspace. IE has no value
	return false;
else 
{
	var strCheck = '47,48,49,50,51,52,53,54,55,56,57,58,59,95,96,97,98,99,100,101,102,103,104,105';
	if (strCheck.indexOf(whichCode) != -1) 
	{
		if (isNav4) 
		{
			if (((vDateValue.length < 6 && dateCheck) || (vDateValue.length == 7 && dateCheck)) && (vDateValue.length >=1)) 
			{
				alert("Data inválida!");
				vDateName.value = "";
				vDateName.focus();
				vDateName.select();
				return false;
			}
			if (vDateValue.length == 6 && dateCheck) 
			{
				var mDay = vDateName.value.substr(2,2);
				var mMonth = vDateName.value.substr(0,2);
				var mYear = vDateName.value.substr(4,4)
				//Turn a two digit year into a 4 digit year
				if (mYear.length == 2 && vYearType == 4) 
				{
					var mToday = new Date();
					//If the year is greater than 30 years from now use 19, otherwise use 20
					var checkYear = mToday.getFullYear() + 30; 
					var mCheckYear = '20' + mYear;
					if (mCheckYear >= checkYear)
						mYear = '19' + mYear;
					else
						mYear = '20' + mYear;
				}
				var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
				if (!dateValid(vDateValueCheck)) 
				{
					alert("Data inválida!");
					vDateName.value = "";
					vDateName.focus();
					vDateName.select();
					return false;
				}
				return true;
			}
			else 
			{
				// Reformat the date for validation and set date type to a 1
				if (vDateValue.length >= 8  && dateCheck) 
				{
					if (vDateType == 1) // mmddyyyy
					{
						var mDay = vDateName.value.substr(2,2);
						var mMonth = vDateName.value.substr(0,2);
						var mYear = vDateName.value.substr(4,4)
						vDateName.value = mMonth+strSeperator+mDay+strSeperator+mYear;
					}
					if (vDateType == 2) // yyyymmdd
					{
						var mYear = vDateName.value.substr(0,4)
						var mMonth = vDateName.value.substr(4,2);
						var mDay = vDateName.value.substr(6,2);
						vDateName.value = mYear+strSeperator+mMonth+strSeperator+mDay;
					}
					if (vDateType == 3) // ddmmyyyy
					{
						var mMonth = vDateName.value.substr(2,2);
						var mDay = vDateName.value.substr(0,2);
						var mYear = vDateName.value.substr(4,4)
						vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear;
					}
					if (vDateType == 4) // ddmmyyyy hh:mm
					{
						var mMonth = vDateName.value.substr(2,2);
						var mDay = vDateName.value.substr(0,2);
						var mYear = vDateName.value.substr(4,4);
						var mHour = " " + vDateName.value.substr(9,2) + ":"+ vDateName.value.substr(12,2)
						vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear+mHour;
					}
					//Create a temporary variable for storing the DateType and change
					//the DateType to a 1 for validation.
					var vDateTypeTemp = vDateType;
					vDateType = 1;
					var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear+mHour;
					if (!dateValid(vDateValueCheck)) 
					{
						alert("Data inválida!");
						vDateType = vDateTypeTemp;
						vDateName.value = "";
						vDateName.focus();
						vDateName.select();
						return false;
					}
					vDateType = vDateTypeTemp;
					return true;

				}
				else 
				{
					if (((vDateValue.length < 8 && dateCheck) || (vDateValue.length == 9 && dateCheck)) && (vDateValue.length >=1)) 
					{
						alert("Data inválida!");
						vDateName.value = "";
						vDateName.focus();
						vDateName.select();
						return false;
			         }
				}
   			}
		}
		else 
		{
			// Non isNav Check
			if (((vDateValue.length < 8 && dateCheck) || (vDateValue.length == 9 && dateCheck)) && (vDateValue.length >=1)) 
			{
				alert("Data inválida!");
				vDateName.value = "";
				vDateName.focus();
				return true;
			}
			// Reformat date to format that can be validated. mm/dd/yyyy
			if (vDateValue.length >= 8 && dateCheck) 
			{
				// Additional date formats can be entered here and parsed out to
				// a valid date format that the validation routine will recognize.
				if (vDateType == 1) // mm/dd/yyyy
				{
					var mMonth = vDateName.value.substr(0,2);
					var mDay = vDateName.value.substr(3,2);
					var mYear = vDateName.value.substr(6,4)
				}	
				if (vDateType == 2) // yyyy/mm/dd
				{
					var mYear = vDateName.value.substr(0,4);
					var mMonth = vDateName.value.substr(5,2);
					var mDay = vDateName.value.substr(8,2);
				}
				if (vDateType == 3) // dd/mm/yyyy
				{
					var mDay = vDateName.value.substr(0,2);
					var mMonth = vDateName.value.substr(3,2);
					var mYear = vDateName.value.substr(6,4);
				}
				if (vDateType == 4) // dd/mm/yyyy
				{
					var mDay = vDateName.value.substr(0,2);
					var mMonth = vDateName.value.substr(3,2);
					var mYear = vDateName.value.substr(6,4);
					var mHour = vDateName.value.substr(10,6);
				}
				if (vYearLength == 4) 
				{
					if (mYear.length < 4) 
					{
						alert("Data inválida!");
						vDateName.value = "";
						vDateName.focus();
						return true;
				   	}
				}
				// Create temp. variable for storing the current vDateType
				var vDateTypeTemp = vDateType;
				// Change vDateType to a 1 for standard date format for validation
				// Type will be changed back when validation is completed.
				vDateType = 1;
				// Store reformatted date to new variable for validation.
				if (vDateTypeTemp == 4)
					var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear+" "+mHour;
				else
					var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
				if (mYear.length == 2 && vYearType == 4 && dateCheck) 
				{
					//Turn a two digit year into a 4 digit year
					var mToday = new Date();
					//If the year is greater than 30 years from now use 19, otherwise use 20
					var checkYear = mToday.getFullYear() + 30; 
					var mCheckYear = '20' + mYear;
					if (mCheckYear >= checkYear)
						mYear = '19' + mYear;
					else
						mYear = '20' + mYear;
						if (vDateTypeTemp == 4)
							vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear+" "+mHour;
						else
							vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear+" "+mHour;
						// Store the new value back to the field.  This function will
						// not work with date type of 2 since the year is entered first.
						if (vDateTypeTemp == 1) // mm/dd/yyyy
							vDateName.value = mMonth+strSeperator+mDay+strSeperator+mYear;
						if (vDateTypeTemp == 3) // dd/mm/yyyy
							vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear;
						if (vDateTypeTemp == 4) // dd/mm/yyyy hh:mm
							vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear+" "+mHour;

				} 
				if (!dateValid(vDateValueCheck)) 
				{
					alert("Data inválida!");
					vDateType = vDateTypeTemp;
					vDateName.focus();
					vDateName.value="";
					return true;
				}
				if (vDateTypeTemp == 4)
				{
					if ((vDateValue.substr(11,2) > 23) || (vDateValue.substr(14,2) > 59) || (vDateValue.length < 16))
					{
						alert("Hora inválida!")
						vDateName.value = vDateValue.substr(0,10) + " ";
						vDateName.focus();
						vDateName.value="";
						return true;
					}
				}
				vDateType = vDateTypeTemp;
				return true;
			}
			else 
			{
			if (vDateType == 1) 
			{
				if (vDateValue.length == 2) 
				{
					vDateName.value = vDateValue+strSeperator;
				}
				if (vDateValue.length == 5) 
				{
					vDateName.value = vDateValue+strSeperator;
		   		}
			}
			if (vDateType == 2) 
			{
				if (vDateValue.length == 4) 
				{
					vDateName.value = vDateValue+strSeperator;
				}
				if (vDateValue.length == 7) 
				{
					vDateName.value = vDateValue+strSeperator;
				}
			} 
			if (vDateType == 3) 
			{
				if (vDateValue.length == 2) 
				{
					vDateName.value = vDateValue+strSeperator;
				}
				if (vDateValue.length == 5) 
				{
					vDateName.value = vDateValue+strSeperator;
				}
			}
			if (vDateType == 4) 
			{
			if (vDateValue.length == 2) 
				{
					vDateName.value = vDateValue+strSeperator;
				}
				if (vDateValue.length == 5) 
				{
					vDateName.value = vDateValue+strSeperator;
				}
				if (vDateValue.length == 10) 
				{
					vDateName.value = vDateValue+" ";
				}
				if (vDateValue.length == 11 && (vDateValue.substr(11,1) != " ")) 
				{
					vDateName.value = vDateValue.substr(0,10) + " " + vDateValue.substr(10,1);
				}				
				if (vDateValue.length == 13) 
				{
					vDateName.value = vDateValue+":";
				}								
			}			
			return true;
		}
	}
	if (vDateValue.length == 10&& dateCheck) 
	{
		if (!dateValid(vDateName)) 
		{
			alert("Data inválida!");
			vDateName.focus();
			vDateName.select();
		}
	}
	if (vDateValue.length == 16&& dateCheck) 
	{
		if (!dateValid(vDateName)) 
		{
			alert("Data inválida!");
			vDateName.focus();
			vDateName.select();
		}
		if ((vDateValue.substr(11,2) > 23) || (vDateValue.substr(14,2) > 59) )
		{
			alert("Hora inválida!")
			vDateValue.value = vDateValue.substr(0,10);
			vDateValue.focus();
			vDateName.select();
		}
	}
	return false;
}
else 
{
	if (isNav4) 
	{
		vDateName.value = "";
		vDateName.focus();
		vDateName.select();
		return false;
	}
	else
	{
		vDateName.value = vDateName.value.substr(0, (vDateValue.length-1));
		return false;
    }
}
}
}
function dateValid(objName) 
{
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;
var strMonthArray = new Array(12);
strMonthArray[0] = "Jan";
strMonthArray[1] = "Feb";
strMonthArray[2] = "Mar";
strMonthArray[3] = "Apr";
strMonthArray[4] = "May";
strMonthArray[5] = "Jun";
strMonthArray[6] = "Jul";
strMonthArray[7] = "Aug";
strMonthArray[8] = "Sep";
strMonthArray[9] = "Oct";
strMonthArray[10] = "Nov";
strMonthArray[11] = "Dec";
//strDate = datefield.value;
strDate = objName;
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);
	}
}
//Adjustment for short years entered
if (strYear.length == 2) 
{
	strYear = '20' + strYear;
}
strTemp = strDay;
strDay = strMonth;
strMonth = strTemp;
intday = parseInt(strDay, 10);
if (isNaN(intday)) 
{
	err = 2;
	return false;
}
intMonth = parseInt(strMonth, 10);
if (isNaN(intMonth)) 
{
	for (i = 0;i<12;i++) 
	{
		if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase()) 
		{
			intMonth = i+1;
			strMonth = strMonthArray[i];
			i = 12;
		}
	}
	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;
}