

<!-- Script vor alten Browsern verstecken

Months = new Array(12);
Months[0] = "Januar";
Months[1] = "Februar";
Months[2] = "März";
Months[3] = "April";
Months[4] = "Mai";
Months[5] = "Juni";
Months[6] = "Juli";
Months[7] = "August";
Months[8] = "September";
Months[9] = "Oktober";
Months[10] = "November";
Months[11] = "Dezember";

function PadSpaces(TheString)
{
        var Spaces = "             ";
        len = Math.round((9 - TheString.length)/2);

        return Spaces.substring(0,len) + TheString;
}

function NumLeapYears(StartYear, EndYear)
{
        var LeapYears, i;

        if (EndYear >= StartYear){
                for(LeapYears = 0; StartYear <= EndYear; StartYear++)
                if (IsLeapYear(StartYear)) LeapYears++;
        }else{
        for(LeapYears = 0; EndYear <= StartYear; EndYear++)
                if (IsLeapYear(EndYear)) LeapYears++;
        }
        return LeapYears;
}

function IsLeapYear(Year)
{
        if(Math.round(Year/4) == Year/4){
                if(Math.round(Year/100) == Year/100){
                        if(Math.round(Year/400) == Year/400)
                                return true;
                        else return false;
                }else return true;
        }
        return false;
}

function Trim(TheString)
{
        var len;

        len = TheString.length;
        while(TheString.substring(0,1) == " "){ //trim left
                TheString = TheString.substring(1, len);
                len = TheString.length;
        }

        while(TheString.substring(len-1, len) == " "){ //trim right
                TheString = TheString.substring(0, len-1);
                len = TheString.length;
        }
        return TheString;
}

function DetermineMonthIdx()
{
        var i, month, month_s, len;


        month = Trim(document.calform.elements[4].value);
        len = month.length;

        for( i = 0; i <12; i++){
                month_s = Months[i].substring(0,len);
                if (month_s.toUpperCase() == month.toUpperCase())
                        return (i);
        }
        return -1;
}

function FindNewYearStartingDay(Year)
{
        var LeapYears, Years, Day;

        LeapYears = NumLeapYears(1995, Year);

        if  (Year >=1995)
                Years = (Year -1995)+LeapYears;
        else    Years = (Year -1995)-LeapYears;

        if  (Year >=1995)
                Day = Math.round(((Years/7 - Math.floor(Years/7))*7)+.1);
        else    Day = Math.round(((Years/7 -  Math.ceil(Years/7))*7)-.1);

        if (Year >=1995){
                if(IsLeapYear(Year)) Day--;
        }else Day += 7;

        if(Day < 0) Day = 6;
        if(Day > 6) Day = 0;
        return Day;
}

function FindNumDaysInMonth(Year, Month)
{
        if(Month == 1){
                if(IsLeapYear(Year)) return 29;
                else return 28;
        }else{
                if(Month >6) Month++;
                if(Month/2 == Math.round(Month/2))  return 31;
        }
 return 30;
}

function FindMonthStartDay(NewYearDay, Year, Month)
{
        var MonthStartDay;

        AddArray = new Array(12);

        AddArray[0]=0;AddArray[1]=3;AddArray[2]=3;AddArray[3]=6;
        AddArray[4]=1;AddArray[5]=4;AddArray[6]=6;AddArray[7]=2;
        AddArray[8]=5;AddArray[9]=0;AddArray[10]=3;AddArray[11]=5;

        MonthStartDay = NewYearDay + AddArray[Month];
        if(IsLeapYear(Year)  && (Month ) > 1) MonthStartDay ++;

        if (MonthStartDay > 6) MonthStartDay -= 7;

        return MonthStartDay;
}

function  FillCalendar()
{
        var Year, Month, Midx, NewYearDay, MonthStartDay;
        var NumDaysInMonth, i, t;

        Year = parseFloat(document.calform.elements[1].value);
        Month = document.calform.elements[4].value;

        Midx  =  DetermineMonthIdx();
        if (Midx == -1){
                alert ("Can't recognize that month");
                return;
        }

        NewYearDay = FindNewYearStartingDay(Year);
        MonthStartDay = FindMonthStartDay(NewYearDay, Year,  Midx);
        NumDaysInMonth = FindNumDaysInMonth(Year, Midx);

        for(i = 6;  i < 43;  i++){
                t = i-5-MonthStartDay;
                if ( t >= 1  &&  t <= NumDaysInMonth)
                        document.calform.elements[i].value =t;
                else document.calform.elements[i].value = "";
        }
}

function IncDecYear(val)
{
        var valNum = parseInt(val);
        var valNum2 = parseInt(document.calform.elements[1].value)
        document.calform.elements[1].value = valNum2 + valNum;

        FillCalendar()
}

function IncDecMonth(val)
{
        var valNum = parseInt(val);
        var Midx  =  DetermineMonthIdx();

        Midx += valNum;
        if(Midx > 11) Midx = 0;
        if(Midx < 0)  Midx = 11;


        document.calform.elements[4].value = PadSpaces(Months[Midx]);

        FillCalendar()
}

// --> Ende des Versteckens vor alten Browsern