function validateCommentForm(form) {
	var req = ["name", "email", "comment"];
	for(var i=0; i<req.length; i++){
		if(!form.elements[req[i]].value){
			alert(form.elements[req[i]].title);
			form.elements.name.focus();
			return false;
		}
	}
	var email = form.elements.email;
	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(email.value)) {
		alert("Por favor, introduce una direcci&oacute;n de email v&aacute;lida");
		email.focus();
		return false;
	}
	if(!form.elements.conditions.checked){
		alert("Por favor, acepta las condiciones de privacidad");
		return false;
	}
	return true;
}