function round (n) {
    n = Math.round(n * 100) / 100;
    n = (n + 0.001) + '';
    return n.substring(0, n.indexOf('.') + 3);
  }


function BerekenPrijs()
{
 var AantalKaarten= theForm.aantal.value
 var Kaartprijs= theForm.kaartprijs.value
 
 if( AantalKaarten!= "" && AantalKaarten> 0 )
 {
  var PrijsTotaal = ( AantalKaarten * Kaartprijs ) 

  if( PrijsTotaal < Kaartprijs )
  {
   alert( "PrijsTotaal is " + PrijsTotaal + ", kan nooit lager zijn dan Kaartprijs" )
  }
  else
  {
	theForm.PrijsTotaal.value=round(PrijsTotaal)
	
  }
 }
}



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('Vul aub een waarde in voor het "' + fieldLabel +'" veld.');
		formField.focus();
		result = false;
	}
	
	return result;
}

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

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

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	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("Vul een geldig email address bijvoorbeeld: jouwnaam@zeelandnet.nl");
		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('Vul aub een geheel getal in voor het "' + fieldLabel +'" veld.');
			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('Vul aub een geheel getal in voor het "' + fieldLabel +'" veld');
			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('Please enter a date in the format MM/DD/YYYY for the "' + fieldLabel +'" field.');
			formField.focus();		
		}
	} 
	
	return result;
}

 


function validateForm(theForm)
{
	// Customize these calls for your form

	// Start ------->
	if (!validNum(theForm.aantal,"Aantal Kaarten",true))
		return false;

	if (!validRequired(theForm.naam,"Naam"))
		return false;

	if (!validRequired(theForm.straat,"Straat"))
		return false;

	if (!validRequired(theForm.huisnummer,"Huisnummer"))
		return false;

	if (!validRequired(theForm.postcode,"Postcode"))
		return false;

	if (!validRequired(theForm.woonplaats,"woonplaats"))
		return false;

	if (!validRequired(theForm.land,"land"))
		return false;

	if (!validEmail(theForm.email,"Email Address",true))
		return false;

	if (!validRequired(theForm.telnr,"telefoonnummer"))
		return false;


	// <--------- End
	
	return true;
}