var spot_a = new Array();
var spot_d = new Array();
var feld_a = new Array();
var feld_d = new Array();

var lauf_year  = vierstelligesJahr();

var calendar_year_a = '2000';
var calendar_year_d = '2000';
var calendar_month_a = '3';
var calendar_month_d = '3';
var startingPos_a;
var startingPos_d;
var focusDay; 
var activeDay_a;
var activeDay_d;
var currentDay_a;
var currentDay_d;
var zugang_a = 0;
var zugang_d = 0;
var focusDay_a;
var focusDay_d;
var monat_wechseln = 0;
var mal_opera =0;
var zuruecksetzen = 0;
var zDatumB;

var zDatumE;
var loc;

function getnumberofdays() {
    input = document.reisedaten;
    anreise = new Date(input.b_jahr.options[input.b_jahr.options.selectedIndex].text, input.b_monat.options[input.b_monat.options.selectedIndex].text, input.b_tag.options[input.b_tag.options.selectedIndex].text,0,0,0);
    abreise = new Date(input.e_jahr.options[input.e_jahr.options.selectedIndex].text, input.e_monat.options[input.e_monat.options.selectedIndex].text, input.e_tag.options[input.e_tag.options.selectedIndex].text,0,0,0);
    anreise_zeit = anreise.getTime() / 1000;
    abreise_zeit = abreise.getTime() / 1000;
    var index = Math.floor(abreise_zeit-anreise_zeit)/60/60/24;
    index = Math.ceil(index);
}

function setDate() 
{
   var oInput;
   oInput = document.reisedaten;
 
	// SET DAY, MONTH AND YEAR TO ANREISE
   with (oInput) {
      var day = focusDay = parseInt(b_tag.options[b_tag.selectedIndex].value);      
      var month = parseInt(b_monat.options[b_monat.selectedIndex].value);      
      month--;
      var year = parseInt(b_jahr.options[b_jahr.selectedIndex].value);      
        if ( !zDatumB ) { zDatumB = new Date ( year, month, day);}
        displayCalendar(day, month, year, 'a');

        // SET DAY, MONTH AND YEAR TO  ABREISE
        var day = focusDay = parseInt(e_tag.options[e_tag.selectedIndex].value);      
        var month = parseInt(e_monat.options[e_monat.selectedIndex].value);      
        month--;
        var year = parseInt(e_jahr.options[e_jahr.selectedIndex].value);      
        if ( !zDatumE ) { zDatumE = new Date ( year, month, day);}
        displayCalendar(day, month, year, 'd');
     }
}

function datum_eintragen() { 
 	input = document.reisedaten;
	input.b_tag.selectedIndex = zDatumB.getDate()-1;
	input.b_monat.selectedIndex = zDatumB.getMonth();
	input.b_jahr.selectedIndex = zDatumB.getFullYear()-lauf_year;
	input.e_tag.selectedIndex = zDatumE.getDate()-1
	input.e_monat.selectedIndex = zDatumE.getMonth();
	input.e_jahr.selectedIndex = zDatumE.getFullYear()-lauf_year;
}

function setToday() {
   // SET DAY MONTH AND YEAR TO TODAY'S DATE
   zuruecksetzen = 1;
   /*  Zurueck setzen datum zum Heute */
   zDatumB = new Date();
 
   focusDay = zDatumB.getDate();
   displayCalendar(zDatumB.getDate(), zDatumB.getMonth(), zDatumB.getFullYear(), 'a');

   zDatumE.setTime( zDatumB.getTime()  + 86400000 );
   focusDay = zDatumE.getDate();
   displayCalendar(zDatumE.getDate(), zDatumE.getMonth(), zDatumE.getFullYear(), 'd');

   datum_eintragen();
   var nav = navigator.appVersion;
   //alert(nav);

   if (window.opera ) {
        if ( parseInt(nav.substr(0,1))>4 ) {           
	      calendar = window.open('./hrsparser?%%cd_hv["COMPLETE"]&%%cd_hv_name["NEXT_PAGE"]=79','cal','WIDTH=390,HEIGHT=260');
          calendar.location = calendar.location;
        }
        else {
            if ( navigator.userAgent.indexOf('Opera 6.0') != -1){
                   opera6_01(mal_opera,loc);
                   mal_opera++;  
 
            }
            else {
               calendar.location.reload(loc);
           }
      }
  
   }
   else {
       // keine Opera
       calendar.location = calendar.location;
  }

 zuruecksetzen = 0;
 }


function vierstelligesJahr() {
	var now = new Date();
	var year = now.getYear();
	year += (year < 1900) ? 1900 : 0;
 
	return year;
}


function setnewMonth(number, which) {
    var year  = eval("calendar_year_" + which);
    var month = number;
    var day   = 0;
    if ( which == 'a' ) {    
        document.reisedaten.b_monat.selectedIndex = month;
    }
    else {
       document.reisedaten.e_monat.selectedIndex = month;
    }

    checkDate(document.reisedaten);  
    setDate();
    
    //    displayCalendar(day, month, year, which);
    if ( document.layers && which == 'a' ) {
       monat_wechseln= 1;
    }
    if ( navigator.userAgent.indexOf('Opera 6.0') != -1){
                  opera6_01(mal_opera,loc);
                  mal_opera++;  
    }
 }

function setnewYear(number, which) {
    var month  = eval("calendar_month_" + which);
    var year = number;
    var day   = 0;

    if ( which == 'a' ) {    
        document.reisedaten.b_jahr.selectedIndex = year-lauf_year;
    }
    else {
        document.reisedaten.e_jahr.selectedIndex = year-lauf_year;
    }

    checkDate(document.reisedaten);
    setDate();
	
    //    displayCalendar(day, month, year, which);
    if ( navigator.userAgent.indexOf('Opera 6.0') != -1){
                  opera6_01(mal_opera,loc);
                  mal_opera++;  
    }
}


function displayCalendar(day, month, year, which) {       
    var markierung = new Array(42);
    var datum = new Array(42);
    var oInput = document.reisedaten;
    day = parseInt(day);
    var startingPos  = "";

    if (which == 'a') {
	    calendar_month_a  = parseInt(month);
    	calendar_year_a  = parseInt(year);
		spot_a  = markierung; 
		feld_a  = datum;
    }
    else {
	     calendar_month_d = parseInt(month);
    	 calendar_year_d = parseInt(year);
		 spot_d = markierung; 
		 feld_d = datum;
    }
    
    var i   = 0;
    var days         = getDaysInMonth(month+1,year);
    var firstOfMonth = new Date(year, month, 1);
     
	// Konvertierung in deutsche Wochentagausgabe !!
    var help = firstOfMonth.getDay();
   
    if (help == 0) {      
         startingPos = help+6;
    } 
    else { 
         startingPos = help-1;
    }

    days += startingPos;

    //    alert("help="+help+" startingPos="+startingPos+" days="+days);

	// MAKE BEGINNING NON-DATE BUTTONS BLANK

    for ( i = 0; i < startingPos; i++) {
        datum[i]= '&nbsp;';
    }

    // SET VALUES FOR DAYS OF THE MONTH

    for (i = startingPos; i < days; i++) {
        datum[i]= i-startingPos+1;
    }

    for (i=days; i<42; i++)  {
        datum[i]= '&nbsp;';
    }

    if (which == 'a') {
            startingPos_a = startingPos; 
    }
    else { 
           startingPos_d = startingPos;
    }

    for (i=0; i<42; i++) {
	    markierung[i] = 'nofocus';
    }

    var a = new Date();
    var lauf_monat_a = a.getMonth();
    var focusDay_a = a.getDate();
    var laufJahr_a = a.getFullYear();

    var d = new Date();
    d.setTime( d.getTime()  + 86400000 );
    var lauf_monat_d = d.getMonth();
    var focusDay_d = d.getDate();
    var laufJahr_d = d.getFullYear();
   
    with (oInput) {

       if ((eval("calendar_month_" + which) == month) && (eval("calendar_year_" + which) == year)) {
          if ( which == 'a' ) { 
		     if ( !focusDay_a ) {
		             focusDay_a = parseInt(b_tag.options[b_tag.selectedIndex].value);
 		     }
		     if (month == lauf_monat_a && year ==laufJahr_d) {
			     markierung[focusDay_a+startingPos-1] = 'focus';
			 }
		     currentDay_a = focusDay; 
             if ( day != 0 ) {
	                  if ( (zugang_a ==1 || month != lauf_monat_a) && zuruecksetzen == 0)   { 
					          markierung[focusDay+startingPos-1] = 'green';
					  }
             }
		  }
 		  else { 
		     if ( !focusDay_d ) {
		             focusDay_d = parseInt(e_tag.options[e_tag.selectedIndex].value);
		     }
         
		     if ( month == lauf_monat_d && year == laufJahr_d) {
				       markierung[focusDay_d+startingPos-1] = 'focus';
		     }
		        
		     currentDay_d = focusDay; 
 
             if ( day != 0 ) {
	                 if ( (zugang_d == 1 || month != lauf_monat_d) && zuruecksetzen == 0) {   
					     markierung[focusDay+startingPos-1] = 'rot';
				     }
             } 
		}
	}
	else { 
 		if (which == 'a') { 
		      currentDay_a = -7; 
		}
 		else { currentDay_d = -7; }
	}

    }  //  end with
    
      if ( zugang_a == 0 && which == 'a' ) { zugang_a = 1; }     
      if ( zugang_d == 0 && which == 'd' ) { zugang_d = 1; }     

}

// GET NUMBER OF DAYS IN MONTH
function getDaysInMonth(month,year)  {
    var days;
    if (month==1 || month==3 || month==5 || month==7 || month==8 ||
        month==10 || month==12)  days=31;
    else if (month==4 || month==6 || month==9 || month==11) days=30;
    else if (month==2)  {
        if (isLeapYear(year)) {
            days=29;
        }
        else {
            days=28;
        }
    }
    return (days);
}

// CHECK TO SEE IF YEAR IS A LEAP YEAR
function isLeapYear (Year) {
    if (((Year % 4)==0) && ((Year % 100)!=0) || ((Year % 400)==0)) {
        return (true);
    }
    else {
        return (false);
    }
}

// SET FORM FIELD VALUE TO THE DATE SELECTED
function returnDate(inDay, which)
{   

 var day   = inDay;
    var month = eval("calendar_month_" + which);
  //  month++;

    var year  = eval("calendar_year_" + which);

    var days         = getDaysInMonth(month,year+lauf_year);

    if (which == 'a') {

	activeDay_a = inDay;
	        if (currentDay_a != activeDay_a) { spot_a[currentDay_a+startingPos_a-1] = 'focus'; }
		for (i=0; i<42; i++) {
			if (spot_a[i] != 'focus') {spot_a[i] = 'nofocus';}
			else {activeDay = i; }
		}

                setDays(document.reisedaten.b_tag, month, year);

  		document.reisedaten.b_tag.selectedIndex=inDay-1;
		document.reisedaten.b_monat.selectedIndex=month;
		document.reisedaten.b_jahr.selectedIndex=year-lauf_year;

	}
	else {
		activeDay_d = inDay;
		if (currentDay_d != activeDay_d) { spot_d[currentDay_d+startingPos_d-1] = 'focus'; }

		for (i=0; i<42; i++) {
			if (spot_d[i] != 'focus') {
			    spot_d[i] = 'nofocus';
			}
			else {
			    activeDay = i;
			}
		}

               setDays(document.reisedaten.e_tag, month, year);

  	       document.reisedaten.e_tag.selectedIndex=inDay-1;
	       document.reisedaten.e_monat.selectedIndex=month;
	       document.reisedaten.e_jahr.selectedIndex=year-lauf_year;

      
      }
        getnumberofdays()

        checkDate(document.reisedaten);
        setDate();


 var nav = navigator.appVersion;
// alert(navigator.userAgent);
   if (window.opera ) {
         if ( parseInt(nav.substr(0,1))>4 ) {
      
  //              alert("OPERA >= 6.05");
              calendar = window.open('./hrsparser?%%cd_hv["COMPLETE"]&%%cd_hv_name["NEXT_PAGE"]=79','cal','WIDTH=390,HEIGHT=260');
              calendar.location = calendar.location;

         }
         else {
     //            alert("OPERA 6.01 oder 7.01");
            if ( navigator.userAgent.indexOf('Opera 6.0') != -1){
  //                alert("opera 6.01");
   
      
                   opera6_01(mal_opera,loc);
  
                    mal_opera++;  
  
            }
            else {
//               alert("opera7.0");

               calendar.location.reload(loc);
           }
     }
   }
   else {
            
            calendar.location = calendar.location;
  }
}
   function opera6_01(v1, l) {

        var cal = "cal";
        var cal_neu = cal.concat(v1);

        calendar.close();
        calendar=window.open(l, cal_neu, 'WIDTH=390,HEIGHT=260');

       window.calendar.focus();
 }