<!-- Original:  Richard Gorremans (RichardG@spiritwolfx.com) -->
<!-- Web Site:  http://www.spiritwolfx.com -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
// Check browser version
var isNav4 = false, isNav5 = false, isIE4 = false
var strSeperator = "/"; 
// If you are using any Java validation on the back side you will want to use the / because 
// Java date validations do not recognize the dash as a valid date separator.
var vDateType = 3; // Global value for type of date format
//                1 = mm/dd/yyyy
//                2 = yyyy/dd/mm  (Unable to do date check at this time)
//                3 = 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;
  }


function DateFormat(vDateName, vDateValue, e, dateCheck, dateType) 
{
  vDateType = dateType;
  // vDateName = object name
  // vDateValue = value in the field being checked
  // e = event
  // dateCheck 
  // True  = Verify that the vDateValue is a valid date
  // False = Format values being entered into vDateValue only
  // vDateType
  // 1 = mm/dd/yyyy
  // 2 = yyyy/mm/dd
  // 3 = dd/mm/yyyy
  //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.focus();
      return true;
    }
  var whichCode = (window.Event && e.which) ? 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;
	}
    }
  if (whichCode == 8) //Ignore the Netscape value for backspace. IE has no value
      return false;
  else 
      {
	  //Create numeric string values for 0123456789/
	  //The codes provided include both keyboard and keypad values
	  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("Invalid Date\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)) 
				      {
                                          if (err==11)
					      alert("Invalid Date\nPlease enter date later than 1902");
					  else
					      alert("Invalid Date\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) 
				      {
					  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;
					      }
					  //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;
					  if (!dateValid(vDateValueCheck)) 
					      {
						  if (err==11)
						      alert("Invalid Date\nPlease enter date later than 1902");
						  else
						      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();
                                  return("3")
				  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 (vYearLength == 4) 
				      {
					  if (mYear.length < 4) 
					      {
						  alert("Invalid Date\nPlease Re-Enter");
						  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.
				  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 == 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 (!dateValid(vDateValueCheck)) 
				      {
					  if (err==11)
					      alert("Invalid Date\nPlease enter date later than 1902");
					  else
					      alert("Invalid Date\nPlease Re-Enter");

					  vDateType = vDateTypeTemp;
					  vDateName.value = "";
					  vDateName.focus();

					  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;
					      }
				      }

				  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);  
				  if (err==11)
				      alert("Invalid Date\nPlease enter date later than 1902");
				  else
				      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.focus();
			  vDateName.select();
			  return false;
		      }
		  else
		      {
		          if (whichCode <= 46 || whichCode == null) 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 (intYear < 1903) 
	{
	    err = 11;
	    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;
}
//  End -->