// Date validation from http://javascript.internet.com/forms/val-date.html
// Other validation:
// Found on http://developer.netscape.com/docs/examples/javascript/formval/overview.html
// (c) 1997 Netscape Communications Corporation

var digits = "0123456789";
var whitespace = " \t\n\r";
var iEmail = "This field must be a valid email address (like user@xyz.com). Please reenter it now."

function checkdate(objName) {
   var datefield = objName;
   if (chkdate(objName) == false) {
      datefield.select();
      alert("That date is invalid.  Please try again.");
      datefield.focus();
      return false;
   } else {
      return true;
   }
}

function chkdate(objName) {
   var strDatestyle = "US"; //United States date style
   //var strDatestyle = "EU";  //European date style
   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;

   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);
      }
   }

   if (strYear.length == 2) {
      strYear = '20' + strYear;
   }

   // US style
   if (strDatestyle == "US") {
      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;
         }
      }
   }

// The following block will reformat it to Mmm DD YYYY
//if (strDatestyle == "US") {
//	datefield.value = strMonthArray[intMonth-1] + " " + intday+" " + strYear;
//} else {
//	datefield.value = intday + " " + strMonthArray[intMonth-1] + " " + strYear;
//}

   return true;
}


function LeapYear(intYear) {
	if (intYear % 100 == 0) {
		if (intYear % 400 == 0) { return true; }
	} else {
		if ((intYear % 4) == 0) { return true; }
	}
	return false;
}

function doDateCheck(from, to) {
	if (Date.parse(from.value) <= Date.parse(to.value)) {
//		alert("The dates are valid.");
      return true;
	} else {
	if (from.value == "" || to.value == "") 
		alert("Both dates must be entered.");
		else 
      	alert("To date must occur after the from date.");
   }
}


function isEmpty(s)  {   return ((s == null) || (s.length == 0))  }
function isDigit(c)  {   return ((c >= "0") && (c <= "9"))        }

function isWhitespace (s){
   var i;
   if (isEmpty(s)) return true;

   for (i = 0; i < s.length; i++)
   {   
      // Check that current character isn't whitespace.
      var c = s.charAt(i);
      if (whitespace.indexOf(c) == -1) return false;
   }
   return true;
}


function isInteger (s){
   var i;

   if (isEmpty(s)) 
      if (isInteger.arguments.length == 1) return false;
      else return (isInteger.arguments[1] == true);

   for (i = 0; i < s.length; i++)
   {   
      // Check that current character is number.
      var c = s.charAt(i);
      if (!isDigit(c)) return false;
   }
   // All characters are numbers.
   return true;
}

function isEmail (s) {
   if (isEmpty(s)) 
      if (isEmail.arguments.length == 1) return false;
      else return (isEmail.arguments[1] == true);
   
   if (isWhitespace(s)) return false;
    
   var i = 1;
   var sLength = s.length;

   // look for @
   while ((i < sLength) && (s.charAt(i) != "@"))    {  i++  }

   if ((i >= sLength) || (s.charAt(i) != "@")) return false;
   else i += 2;

   while ((i < sLength) && (s.charAt(i) != "."))    {  i++  }

   if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
   else return true;
}

// datetime parsing and formatting routimes. modify them if you wish other datetime format
function str2dt4 (str_datetime) {
	var re_date = /^(\d+)\/(\d+)\/(\d+)$/;
	if (!re_date.exec(str_datetime))
		return alert("Invalid Datetime format: "+ str_datetime);
	return (new Date (RegExp.$1, RegExp.$2-1, RegExp.$3));
}
//  End -->