<!-- Begin
function checkdate(objName,objTag,objMonat,objJahr) {
var datefield = objName;
if (chkdate(objName,objTag,objMonat,objJahr) == false) {
datefield.select();
datefield.focus();
return false;
}
else {
return true;
   }
}
function chkdate(objName,objTag,objMonat,objJahr) {
//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] = "Mär";
strMonthArray[3] = "Apr";
strMonthArray[4] = "Mai";
strMonthArray[5] = "Jun";
strMonthArray[6] = "Jul";
strMonthArray[7] = "Aug";
strMonthArray[8] = "Sep";
strMonthArray[9] = "Okt";
strMonthArray[10] = "Nov";
strMonthArray[11] = "Dez";
strDate = datefield.value;
if (strDate.length < 1) {
return false;
}
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);
   }
else {
   return false;
}
}
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;
}
}
}
if (strDatestyle == "US") {
datefield.value = strMonthArray[intMonth-1] + " " + intday+" " + strYear;
}
else {
// datefield.value = intday + " " + strMonthArray[intMonth-1] + " " + strYear;
objTag.value = intday;
objMonat.value = intMonth;
objJahr.value = 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() {

}

function TestDate(){
if ((document.Formular.von.value.length!=0) || (document.Formular.bis.value.length!=0))
{	
   if (checkdate(document.Formular.von,document.Formular.Frei_von_Tag,document.Formular.Frei_von_Monat,document.Formular.Frei_von_Jahr) && checkdate(document.Formular.bis,document.Formular.Frei_bis_Tag,document.Formular.Frei_bis_Monat,document.Formular.Frei_bis_Jahr))
   {  
      if(parseInt(document.Formular.Frei_von_Jahr.value) < parseInt(document.Formular.Frei_bis_Jahr.value))
      {
     	 return true;
      }
      else
      {
		 if(parseInt(document.Formular.Frei_von_Monat.value) < parseInt(document.Formular.Frei_bis_Monat.value) && document.Formular.Frei_von_Jahr.value==document.Formular.Frei_bis_Jahr.value)
         {
			 return true;
         }
         else
         {
			 if(parseInt(document.Formular.Frei_von_Tag.value) <= parseInt(document.Formular.Frei_bis_Tag.value) && document.Formular.Frei_von_Monat.value==document.Formular.Frei_bis_Monat.value)
             {
                 return true;
             }
             else
             {
                 alert("Von-Datum muss vor Bis-Datum sein!");
                 return false;
             }
         }
      }
   }
else {
   alert("Bitte berichtigen Sie Ihre Datumseingabe");
   return false;
   }
}
else
return true;
}

//  End -->