function checkdate(objName) {
  var datefield = objName;
  if (chkdate(objName) == false)
  {
    alert("Zadané datum není platné. Zadávejte datum ve formátu Den.Měsíc.Rok");
    setTimeout(function(){objName.focus()},100);
    return false;
  } else {
    return true;
  }
}

function chkdate(objName) {
//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] = "1";
strMonthArray[1] = "2";
strMonthArray[2] = "3";
strMonthArray[3] = "4";
strMonthArray[4] = "5";
strMonthArray[5] = "6";
strMonthArray[6] = "7";
strMonthArray[7] = "8";
strMonthArray[8] = "9";
strMonthArray[9] = "10";
strMonthArray[10] = "11";
strMonthArray[11] = "12";
strDate = datefield.value;
if (strDate.length < 1) {
return true;
}
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];
if (strYear.length == 2) {
strYear = '20' + strYear;
}


}
booFound = true;
   }
}
if (booFound == false) {
if (strDate.length>5) {
strDay = strDate.substr(0, 2);
strMonth = strDate.substr(2, 2);
strYear = strDate.substr(4);

   }
}
//if(strYear.length!=4) return false;
//if (strYear.length == 2) {
//strYear = '20' + strYear;
//}

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 (intYear>2100) return false;
if (intYear<1900) 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+" " + intYear;
}
else {
//datefield.value = intday + "." + intMonth-1 + "." + strYear;


var xdate;
xdate = new Date();


datefield.value = intday + "." + (intMonth)+"." + intYear;

datefield.value = intday + "." + (intMonth)+"." + intYear;

}
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 set(str)
{
  document.getElementById("stranka").value = str;
}

function totalVymazFormulare(idecko)
{  
  if(document.getElementById(idecko))
    var frm = document.getElementById(idecko);
  if(document.forms[idecko])
    var frm = document.forms[idecko];    
  
  if(frm)
  {
    for (i = 0;i<frm.elements.length;i++) {
      if(frm.elements[i]){
        vymazElement(frm.elements[i]);
      }
    }  
  } else {

    for (i = 0;i<document.forms.length;i++) {
      var frm = document.forms[i];
      for (j = 0;j<frm.elements.length;j++) {
        if(frm.elements[j]){
          vymazElement(frm.elements[j]);
        }
      } 
    }       
  }
}

function vymazElement(input)
{
  switch(input.type)
  {
    case 'checkbox':
    case 'radio': 
      input.checked=false; 
    break;
    case 'password':
    case 'text':
    case 'textarea':
    case 'file':
      input.value='';
    break; 
    case 'select':
    case 'select-one': 
      input.options[0].selected=true; 
    break;
  }
}

function objectDetail(obj) {
   var result = ""
   for (var i in obj) {
      result += "." + i + " = " + obj[i] + "\n"
   }
   //alert(result);
   document.write(result);
}