function check_file_ext(field, exts)
{
	if(field.value == '') return true;

	arrExt = exts.toUpperCase().split(',');
	var val = field.value.toUpperCase();
	var pos = val.lastIndexOf( '.' );
	
	var field_ext = '';
	if( pos >= 0 ) field_ext = val.substring( pos+1, val.length );

	for(i=0; i < arrExt.length; i++)
	{
		if( field_ext == arrExt[i] ) return true;
	}

	alert('The file must be in the format of '+exts+'.');
	field.focus();
	return false;
}

function check_empty(field)
{
	if(TrimString(field.value) == '')
	{
		//field.focus();
		return false;
	}
	if(TrimString(field.value) == '-1')
	{
		//field.focus();
		return false;
	}
	return true;
}

function check_int(field)
{
	if(isNaN(field.value) || field.value.indexOf('.') >= 0 || field.value.substring(0,1) == '-')
	{
		//field.focus();
		return false;
	}
	return true;
}

function containChar(str, invalidChars)
{
	for (i=0; i<invalidChars.length; i++) {
		badChar = invalidChars.charAt(i);
		if (str.indexOf(badChar, 0) != -1) {
			return true;
		}
	}
	return false;
}

function validEmail(email) {
	invalidChars = " /:,;#!'<>~";
	for (i=0; i<invalidChars.length; i++) {
		badChar = invalidChars.charAt(i);
		if (email.indexOf(badChar, 0) != -1) {
			return false;
		}
	}
	atPos = email.indexOf("@", 1);
	if (atPos == -1) {
		return false;
	}
	if (email.indexOf("@", atPos+1) != -1) {
		return false;
	}
	periodPos = email.indexOf(".", atPos);
	if (periodPos == -1) {
		return false;
	}
	if (periodPos+3 > email.length) {
		return false;
	}
	return true;
}

function Refresh(Win){
	Win.location.href = Win.location;
}

function TrimString(str){
	while(''+str.charAt(str.length-1)==' ')str=str.substring(0,str.length-1);	
	return str;
}

function Goto(page){
	parent.location = page;	
}

function Valid_Date(DateField){
var checkstr = "0123456789";
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(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 no error, write the completed date to Input-Field (e.g. 13.12.2001) */
   if (err == 0) {
      return true;
      //DateField = day + seperator + month + seperator + year;
   }
   /* Error-message if err != 0 */
   else {
      return false;
      //alert(FieldName + " is incorrect!");
      //DateField.select();
	  //DateField.focus();
   }
}
function changeLang(orginal, change){
          var loc = location.href;
          window.location =loc.replace(orginal,change);
}