var checkstr = "0123456789";
 
function check_date(field) {
var Datevalue = "";
var DateTemp = "";
var seperator = "-";
var DateField = field
var day;
var month;
var year;
var leap = 0;
var err = 0;
var i;
   err = 0;
   DateValue = field.value
   /* 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(2,2);
   if ((month < 1) || (month > 12)) {
      err = 21;
   }
   /* Validation of day*/
   day = DateValue.substr(0,2);
   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 (err != 0) {
		alert("FEJL i dato!! (Skrives: dd-mm-aaaa)")
		field.focus();
		field.select()
		return false;
   }else {
		DateField.value = day + seperator + month + seperator + year;
		return true
   }
}
function check_time(field) {
	var delimiter = ":";
	var err = 0;
	var i;
	var TimeValue = field.value;
	var TimeTemp = "";

	for (i = 0; i < TimeValue.length; i++) {
		if (checkstr.indexOf(TimeValue.substr(i,1)) >= 0) {
		   TimeTemp += TimeValue.substr(i,1);
		}
	}
	TimeValue = TimeTemp;
	   
	if (TimeValue.length > 4 ) {err = 1}
	if (TimeValue.length == 0) {TimeValue = "";field.value="";}

	if (err != 0)	{
		field.focus();
		field.select();
		alert("FEJL i tid!! (Skrives: hh:mm)")
		return false
	}else{
		if (TimeValue.length < 3 && TimeValue.length > 0) {
				field.value = TimeValue +":00"
		}
		if (TimeValue.length == 3) {
				field.value = TimeValue.substr(0,1) +":"+ TimeValue.substr(1,2)
		}
		if (TimeValue.length == 4) {
				field.value = TimeValue.substr(0,2) +":"+ TimeValue.substr(2,2)
		}
		return true
	}
}