function setCurr(c){
  document.getElementById('set_currency').value = c
}

function mktime() {
    
    var no, ma = 0, mb = 0, i = 0, d = new Date(), argv = arguments, argc = argv.length;
    d.setHours(0,0,0); d.setDate(1); d.setMonth(1); d.setYear(1972);
 
    var dateManip = {
        0: function(tt){ return d.setHours(tt); },
        1: function(tt){ return d.setMinutes(tt); },
        2: function(tt){ set = d.setSeconds(tt); mb = d.getDate() - 1; return set; },
        3: function(tt){ set = d.setMonth(parseInt(tt)-1); ma = d.getFullYear() - 1972; return set; },
        4: function(tt){ return d.setDate(tt+mb); },
        5: function(tt){ return d.setYear(tt+ma); }
    };
    
    for( i = 0; i < argc; i++ ){
        no = parseInt(argv[i]*1);
        if (isNaN(no)) {
            return false;
        } else {
            if(!dateManip[i](no)){
                return false;
            }
        }
    }
 
    return Math.floor(d.getTime()/1000);
}

function checkIndividualRequest(){

beg = mktime(0, 0, 0, form.from_month.value, form.from_day.value, form.from_year.value);
end = mktime(0, 0, 0, form.to_month.value, form.to_day.value, form.to_year.value);

  if (form.dateFrom.value > beg || form.dateTo.value < beg){
    alert("Datum příjezdu neodpovídá platnosti nabídky.");
    return false;
  }
  
  if (form.dateFrom.value > end || form.dateTo.value < end){
    alert("Datum odjezdu neodpovídá platnosti nabídky.");
    return false;
  }

  return true;

}

function adjustDate(e){

  fD = e.form.from_day.selectedIndex+1
  fM = e.form.from_month.selectedIndex+1
  fY = e.form.from_year.selectedIndex+2008
  
  tmk = mktime(0, 0, 0, fM, fD, fY) + 432000
    
  d = new Date();
  d.setTime(tmk*1000);
  
   
  tD = d.getDate();
  tM = d.getMonth()+1;
  tY = d.getYear();

  
   e.form.to_day.selectedIndex = tD-1
   e.form.to_month.selectedIndex = tM-1

   if (tY < 500)tY += 1900; 
   
   fixY = tY-2008

   

   e.form.to_year.selectedIndex = fixY
   
  fY += 1;
  tY += 1;
  
  e.form.hidden_date_from.value = fD+'.'+fM+'.'+fY; 
  e.form.hidden_date_to.value = tD+'.'+tM+'.'+tY;  

}

var dtCh= ".";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}

	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)

	if (pos1==-1 || pos2==-1){
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		return false
	}
return true
}


function checkDate(lang, date, month, year, date2, month2, year2){

  var now = new Date();

  var from = new Date();
    from.setDate(date);
    from.setMonth(month-1);
    from.setYear(year);
  var to = new Date();
    to.setDate(date2);
    to.setMonth(month2-1);
    to.setYear(year2);    

    if(isDate(+month+"."+date+"."+year) && isDate(+month2+"."+date2+"."+year2) && (to > from) && (to >= now) && (from >= now) && (from - now) > 24*3*60*60*1000) {
      return true;
    }else if( (from - now) <= 24*3*60*60*1000 ){
    
      switch(lang){
        case 2:
          str = "Příjezd musí být 4 dny od dnešního data";
        break;
        case 5:
          str = "Anreise müssen 4 Tage ab heute";
        break;
        case 7:
          str = "День должен быть 4 дней с сегодняшней даты";
        break;
        default:
          str = "Arrival must be 4 days from today's date";
        break;                        
      }
      alert(str);
      return false;      
    
    }else{
      switch(lang){
        case 2:
          str = "Bylo vloženo neplatné datum";
        break;
        case 5:
          str = "Ungültiges Datum";
        break;
        case 7:
          str = "Неправильная дата";
        break;
        default:
          str = "Invalid date";
        break;                        
      }
      alert(str);
      return false;
    }
}