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('Bitte füllen Sie das Feld "' + fieldLabel +'" aus.');
		formField.focus();
		result = false;
	}
	
	return result;
}

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

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("Please enter an emailaddress like: yourname@yourdomain.com.");
		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('Please enter a number for the "' + fieldLabel +'" field.');
			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('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}



function validateForm(theForm)
{	
	if (!validRequired(theForm.voornaam,"Vorname"))
		return false;
	if (!validRequired(theForm.naam,"Name"))
		return false;
	if (!validRequired(theForm.bedrijfsnaam,"Firmenname"))
		return false;
	if (!validRequired(theForm.straat,"Strasse + Hausnummer"))
		return false;
	if (!validRequired(theForm.postcode,"Postleitzahl"))
		return false;
	if (!validRequired(theForm.plaats,"Wohnort"))
		return false;
	if (!validRequired(theForm.tel,"Tel"))
		return false;
	if (!validEmail(theForm.email,"E-mail"))
		return false;
	if (!validRequired(theForm.ondernemingsnummer,"Steuernummer"))
		return false;
	if (!validRequired(theForm.domein1,"Domeinnaam 1"))
		return false;
	if(theForm.checkbox.checked == false)
	{
		alert("You need to accept our conditions.");
		return false;
	}
		
		return true;
	}