function isEmailAddr(email)
{
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
	result = true;
  }
  return result;
}

function validRequired(formField,fieldLabel)
{
	var result = true;

	if (formField.value == "")
	{
		alert('Required field "' + fieldLabel +'"');
		formField.focus();
		result = false;
	}

	return result;
}

function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset)
{
	var result = true;

	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}

	return result;
}

function validEmail(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

	if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
	{
		alert("Enter correct e-mail adress");
		formField.focus();
		result = false;
	}

  return result;

}

function validNum(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('Field "' + fieldLabel +'" needs a number');
			formField.focus();
			result = false;
		}
	}

	return result;
}


function validInt(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result)
 	{
 		var num = parseInt(formField.value,10);
 		if (isNaN(num))
 		{
 			alert('Field "' + fieldLabel +'" needs a number');
			formField.focus();
			result = false;
		}
	}

	return result;
}


function validDate(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result)
 	{
 		var elems = formField.value.split("/");

 		result = (elems.length == 3); // should be three components

 		if (result)
 		{
 			var month = parseInt(elems[0],10);
  			var day = parseInt(elems[1],10);
 			var year = parseInt(elems[2],10);
			result = allDigits(elems[0]) && (month > 0) && (month < 13) &&
					 allDigits(elems[1]) && (day > 0) && (day < 32) &&
					 allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
 		}

  		if (!result)
 		{
 			alert('Datum upisan u polje "' + fieldLabel +'" mora biti u formatu MM/DD/GGGG');
			formField.focus();
		}
	}

	return result;
}

function validateForm(theForm)
{

// Poèetak izmjena za prilagodbu forme------->
	if (!validRequired(theForm.apar,"Choose apartment"))
		return false;
	if (!validRequired(theForm.name,"Name and last name"))
		return false;
	if (!validRequired(theForm.telefon,"Phone"))
		return false;
	if (!validRequired(theForm.dolazak,"Date of arrival"))
		return false;
	if (!validRequired(theForm.odlazak,"Date of departure"))
		return false;
	if (!validRequired(theForm.security_code,"Enter security code"))
		return false;

	if (!validEmail(theForm.email,"Enter valid e-mail",true))
		return false;

	// <---------  Kraj

	var edolazak = document.getElementById('dolazak').value;
	var eodlazak = document.getElementById('odlazak').value;

	pdolazak = edolazak.split('-');
	podlazak = eodlazak.split('-');

	var dolazak = new Date(pdolazak[0], pdolazak[1] - 1, pdolazak[2]);
	var odlazak = new Date(podlazak[0], podlazak[1] - 1, podlazak[2]);

	var one_day = 1000*60*60*24;

	if((Math.ceil(odlazak.getTime() - dolazak.getTime()) / one_day) > 0){
		return true;
	} else {
		alert("Date of arrival is sooner than date of departure!");
		return false;
	}

	return true;
}