function check_date(field){
var checkstr = "0123456789";
var DateField = field;
var Datevalue = "";
var DateTemp = "";
var seperator = "/";
var day;
var month;
var year;
var leap = 0;
var err = 0;
var i;
   err = 0;
   DateValue = DateField;
   /* Delete all chars except 0..9 */
   for (i = 0; i < DateValue.length; i++) {
	  if (checkstr.indexOf(DateValue.substr(i,1)) >= 0) {
	     DateTemp = DateTemp + DateValue.substr(i,1);
	  }
   }
   DateValue = DateTemp;
   /* Always change date to 8 digits - string*/
   /* if year is entered as 2-digit / always assume 20xx */
   if (DateValue.length == 6) {
      DateValue = DateValue.substr(0,4) + '20' + DateValue.substr(4,2); }
   if (DateValue.length != 8) {
      err = 19;}
   /* year is wrong if year = 0000 */
   year = DateValue.substr(4,4);
   if (year == 0) {
      err = 20;
   }
   /* Validation of month*/
   month = DateValue.substr(0,2);
   if ((month < 1) || (month > 12)) {
      err = 21;
   }
   /* Validation of day*/
   day = DateValue.substr(2,2);
   if (day < 1) {
     err = 22;
   }
   /* Validation leap-year / february / day */
   if ((year % 4 == 0) || (year % 100 == 0) || (year % 400 == 0)) {
      leap = 1;
   }
   if ((month == 2) && (leap == 1) && (day > 29)) {
      err = 23;
   }
   if ((month == 2) && (leap != 1) && (day > 28)) {
      err = 24;
   }
   /* Validation of other months */
   if ((day > 31) && ((month == "01") || (month == "03") || (month == "05") || (month == "07") || (month == "08") || (month == "10") || (month == "12"))) {
      err = 25;
   }
   if ((day > 30) && ((month == "04") || (month == "06") || (month == "09") || (month == "11"))) {
      err = 26;
   }
   /* if 00 ist entered, no error, deleting the entry */
   if ((day == 0) && (month == 0) && (year == 00)) {
      err = 0; day = ""; month = ""; year = ""; seperator = "";
   }
   /* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */
   if (err == 0) {
      return month + seperator + day + seperator + year;
   }
   /* Error-message if err != 0 */
   else {
      alert("Date is incorrect.  Please format like mm/dd/yyyy");
      return DateValue;
   }
}


//////////
function formatExpDate(field){
var checkstr = "0123456789";
var DateValue = field;
var DateTemp = "";
var seperator = "/";
var month;
var year;
var leap = 0;
var err = 0;
var i;

   err = 0;
   
   /* Delete all chars except 0..9 */
   for (i = 0; i < DateValue.length; i++) {
	  if (checkstr.indexOf(DateValue.substr(i,1)) >= 0) {
	     DateTemp = DateTemp + DateValue.substr(i,1);
	  }
   }
   
   DateValue = DateTemp;
   /* Always change date to 6 digits - string*/
   /* if year is entered as 2-digit / always assume 20xx */
   if (DateValue.length == 4) {
      DateValue = DateValue.substr(0,2) + '20' + DateValue.substr(2,4); }
   if (DateValue.length != 6) {
      err = 19;}
   /* year is wrong if year = 0000 */
   year = DateValue.substr(2,4);
   if (year == 0) {
      err = 20;
   }
   /* Validation of month*/
   month = DateValue.substr(0,2);
   if ((month < 1) || (month > 12)) {
      err = 21;
   }
   
   /* Validation leap-year / february / day */
   if ((year % 4 == 0) || (year % 100 == 0) || (year % 400 == 0)) {
      leap = 1;
   }
   
   /* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */
   if (err == 0) {
      return month + seperator + year;
   }
   /* Error-message if err != 0 */
   else {
      //alert("Expiration date is incorrect. Please format date like mm/yy or mm/yyyy.");
      return DateValue;
   }
}


///////////////////////////
function isNum(argvalue) {
	argvalue = argvalue.toString();

	if (argvalue.length == 0)
	return false;

	for (var n = 0; n < argvalue.length; n++)
	if (argvalue.substring(n, n+1) < "0" || argvalue.substring(n, n+1) > "9")
	return false;

	return true;
}


/////////////////////
function formatPhone(field){
var checkstr = "0123456789";
var phoneValue = field;
var phoneTemp = "";
var seperator = "-";
var areaCode;
var threeDigit;
var fourDigit;
var err = 0;
var i;

   err = 0;
   
   /* Delete all chars except 0..9 */
   for (i = 0; i < phoneValue.length; i++) {
	  if (checkstr.indexOf(phoneValue.substr(i,1)) >= 0) {
	     phoneTemp = phoneTemp + phoneValue.substr(i,1);
	  }
   }
   
   phoneValue = phoneTemp;
   /* Always change date to 10 digits - string*/
   /* if year is entered as 2-digit / always assume 20xx */
   //if (phoneValue.length == 4) {
   //   phoneValue = phoneValue.substr(0,2) + '20' + phoneValue.substr(2,4); }
   if (phoneValue.length != 10 && phoneValue.length != 7) {
	  alert("Please enter a 10 digit phone/fax number.")
      err = 19;}
      
   if (phoneValue.length == 7) {
	  alert("Please enter the area code for this number.")
      err = 19;}
      
   areaCode = phoneValue.substr(0,3);
   threeDigit = phoneValue.substr(3,3);
   fourDigit = phoneValue.substr(6,4);
      
   /* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */
   if (err == 0) {
      return areaCode + seperator + threeDigit + seperator + fourDigit;
   }
   /* Error-message if err != 0 */
   else {
      return phoneValue;
   }
}


//////////
function formatZipCode(field){
var checkstr = "0123456789";
var ZipValue = field;
var ZipTemp = "";
var seperator = "-";
var firstFive;
var lastFour;
var err = 0;
var i;

   err = 0;
   
   /* Delete all chars except 0..9 */
   for (i = 0; i < ZipValue.length; i++) {
	  if (checkstr.indexOf(ZipValue.substr(i,1)) >= 0) {
	     ZipTemp = ZipTemp + ZipValue.substr(i,1);
	  }
   }
   
   ZipValue = ZipTemp;
   
   if (ZipValue.length != 5 && ZipValue.length != 9) {
		var invalidNum = true;
		alert("Please enter a 5 or 9 digit zip code");
		err = 19;
	}
   
   if (ZipValue.length == 5) {
      var FiveDigitNum = true;
      }
      
   firstFive = ZipValue.substr(0,5);
   if (firstFive == 0) {
      err = 20;
   }
   
   lastFour = ZipValue.substr(5,4);
   if (lastFour == 0 && !FiveDigitNum) {
	  alert("Please enter a valid 9 digit zip code.");
      err = 21;
   }
   
   
   /* if no error, write the completed date to Input-Field (e.g. 13.12.2001) */
   if (err == 0) {
	  if (FiveDigitNum) {
		return firstFive;
	  }else{
		return firstFive + seperator + lastFour;
      }
   }
   /* Error-message if err != 0 */
   else {
      //alert("Zip code is incorrect. Please format date like #####-####.");
      return ZipValue;
   }
}