function checkform ( form )
{
  // ** START **
  
  if (document.getElementById('naam').value == "") {
    alert( "You didn't fill in a name." );
    document.getElementById('naam').focus();
    return false ;
  }
  if (document.getElementById('email').value == "") {
    alert( "You didn't fill in an email adress." );
    document.getElementById('email').focus();
    return false ;
  }
  if (document.getElementById('bericht').value == "") {
    alert( "You didn't fill in a message." );
    document.getElementById('bericht').focus();
    return false ;
  }
  if (!checkEmail(document.getElementById('email').value))
  {
  	alert("The E-mail adress you entered is incorrect.");
	document.getElementById('email').focus();
	return false ;
  }
  // ** END **
  return true ;
}
// Begin
function checkEmail(email)
 {
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email))
	{
	return (true)
	}
    else{
	return (false)
	}
}
//  End