var isNav4 = false, isNav5 = false, isIE4 = false
var strSeperator = "/";
var vDateType = "dd/MM/yyyy"; // Global value for type of date format
//                 "MM/dd/yyyy"
//                "yyyy/dd/MM" (Unable to do date check at this time)
//                "dd/mm/yyyy"
var vYearType = 4; //Set to 2 or 4 for number of digits in the year for Netscape
var vYearLength = 2; // 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;
}


// Connector function which is used as the event handler (onkeyup and onchange) for date fields.  It calls the old
// validateDate function (JE 11/21/2006)
function validateDateField(e, vDateName) {
	if (!e) {
		e = window.event;
	}
	
	// vDateName should be the HTML input which triggered the status change.  We may have to assign in manually
	if (!vDateName)
		vDateName = this;
	vDateValue = vDateName.value;
	dateCheck = false;
	dateType = vDateName.vDateType;
	return validateDate(vDateName, vDateValue, e, dateCheck, dateType);
}

///////////////////////////////////////////////////////////////////////////////////
/* Parameters
    - vDateName = object name
    - vDateValue = value in the field being checked
    - e = event
    - dateCheck [true | false]
         [true] = Verify that the vDateValue is a valid date
         [false] = Format values being entered into vDateValue only
    - vDateType 
		     "MM/dd/yyyy"
				 "yyyy/MM/dd"
				 "dd/MM/yyyy" */
///////////////////////////////////////////////////////////////////////////////////
function validateDate(vDateName, vDateValue, e, dateCheck, dateType) {
  vDateType = dateType;
	
	// Enter a tilde sign for the first number and you can check the variable information.
	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.select();
		vDateName.focus();
		return true;
	}
	
	var whichCode;
	if (e) {
		whichCode = (window.Event) ? e.which : e.keyCode;
	}
	
	// Check to see if a seperator is already present.
	// bypass the date if a seperator is present and the length greater than 8
	if (vDateValue.length > 8 && isNav4) {
	  if ((vDateValue.indexOf("-") >= 1) || (vDateValue.indexOf("/") >= 1)) {
		  return true;
		}
	}

  // Eliminate all the ASCII codes that are not valid
	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;
		}
	}
	
	//Ignore the Netscape value for backspace. IE has no value
	if (whichCode == 8 || whichCode == 46 || (whichCode > 34 && whichCode < 41)) { // also ignore delete and arrow keys (JE 11/21/2006)
		return false;
	}
	
	// Create numeric string values for 0123456789/
	// The codes provided include both keyboard and keypad values
	else {
		var strCheck = '9,11,13,17,18,19,20,45,47,48,49,50,51,52,53,54,55,56,57,58,59,95,96,97,98,99,100,101,102,103,104,105';
		if (!whichCode || strCheck.indexOf(whichCode) != -1) {	// whichCode will be undefined if there was no key stroke (JE 11/21/2006)
			if (isNav4) {
				if (((vDateValue.length < 6 && dateCheck) || (vDateValue.length == 7 && dateCheck)) && (vDateValue.length >=1)) {
					alert("Invalid Date Length\nPlease Re-Enter");
					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("Date Value Checked... Invalid\nPlease Re-Enter");
						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) {
					
						// MM/dd/yyyy
						if (vDateType == "MM/dd/yyyy") {
							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;
						}
						
						// yyyy/MM/dd
						if (vDateType == "yyyy/MM/dd") {
							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;
						}
						
						//dd/MM/yyyy
						if (vDateType == "dd/MM/yyyy") {
							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;
						}
						
						// Create a temporary variable for storing the DateType and change
						// the DateType to a "MM/dd/yyyy" for validation.
						var vDateTypeTemp = vDateType;
						vDateType = "MM/dd/yyyy";
						var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
						if (!dateValid(vDateValueCheck)) {
							alert("Invalid Date\nPlease Re-Enter");
							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("Invalid Date\nPlease Re-Enter");
							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("Invalid Date\nPlease Re-Enter");
					vDateName.value = "";
					vDateName.focus();
					vDateName.select();
					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 == "MM/dd/yyyy") { // "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 == "yyyy/MM/dd") { // "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 == "dd/MM/yyyy") { // "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 (vYearLength == 4) {
						if (mYear.length < 4) {
							alert("Invalid Year Length\nPlease Re-Enter");
							vDateName.value = "";
							vDateName.focus();
							vDateName.select();
							return true;
						}
					}
					
					// Create temp. variable for storing the current vDateType
					var vDateTypeTemp = vDateType;
					
					// Change vDateType to a "MM/dd/yyyy" for standard date format for validation
					// Type will be changed back when validation is completed.
					vDateType = "MM/dd/yyyy";
					
					// Store reformatted date to new variable for validation.
					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;
						}
						vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear;
						// 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 == "MM/dd/yyyy") { // "MM/dd/yyyy"
							vDateName.value = mMonth+strSeperator+mDay+strSeperator+mYear;
						}
						if (vDateTypeTemp == "dd/MM/yyyy") { // dd/MM/yyyy
							vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear;
						}
					}
					if (!dateValid(vDateValueCheck)) {
						alert("Invalid Date\nPlease Re-Enter");
						vDateType = vDateTypeTemp;
						vDateName.value = "";
						vDateName.focus();
						vDateName.select();
						return true;
					}
					vDateType = vDateTypeTemp;
					return true;
				}
				else {
					if (vDateType == "MM/dd/yyyy") {
						if (vDateValue.length == 2) {
							vDateName.value = vDateValue+strSeperator;
						}
						if (vDateValue.length == 5) {
							vDateName.value = vDateValue+strSeperator;
						}
					}
					if (vDateType == "yyyy/MM/dd") {
						if (vDateValue.length == 4) {
							vDateName.value = vDateValue+strSeperator;
						}
						if (vDateValue.length == 7) {
							vDateName.value = vDateValue+strSeperator;
						}
					}
					if (vDateType == "dd/MM/yyyy") {
						if (vDateValue.length == 2) {
							vDateName.value = vDateValue+strSeperator;
						}
						if (vDateValue.length == 5) {
							vDateName.value = vDateValue+strSeperator;
						}
					}
					return true;
				}
   		}
			
			if (vDateValue.length == 10 && dateCheck) {
				if (!dateValid(vDateName)) {
					// Un-comment the next line of code for debugging the dateValid() function error messages
					//alert(err);
					alert("Invalid Date\nPlease Re-Enter");
					vDateName.focus();
					vDateName.select();
				}
			}
			return false;
		}
		else {
			// If the value is not in the string return the string minus the last
			// key entered.
			if (isNav4) {
				vDateName.value = "";
				vDateName.select();
				vDateName.focus();
				return false;
			}
			else {
			  if (whichCode && vDateName.value) {
			  	lindex = vDateName.value.toUpperCase().lastIndexOf (String.fromCharCode(whichCode).toUpperCase());
			  	if (lindex > -1) {
			  		newValue = "";
			  		// get chars before bad char
			  		if (lindex > 0) {
			  			newValue += vDateName.value.substr(0, lindex);
			  		}
			  		// get chars after bad char
			  		if (lindex < vDateValue.length - 1) {
			  			newValue += vDateName.value.substr (lindex + 1, vDateValue.length);
			  		}
			  // Do not just automatically delete last char, the bad char may have been entered in the middle of the field (JE 11/21/2006)
			  //vDateName.value = vDateName.value.substr(0, (vDateValue.length-1));	
					vDateName.value = newValue;
				}
			   }
			   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;
}