function validateComment(commentForm) {
	// check required fields
	if(commentForm.byline.value == '' || commentForm.email.value == '' || commentForm.title.value == '' || commentForm.body.value == '') {
		alert('Alle felter m\u00e5 fylles ut.');
		return false;
	}
	
	// validate email
	var emailRegex = /[a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/i;
	if(!emailRegex.test(commentForm.email.value)) {
		alert('Oppgitt epost adresse er ikke gyldig.');
		return false;
	}
	
	return true;
}