form_mail_pref = function() {
	if (!document.getElementById) return false;
	var url = document.location.toString();
	if (url.match('form_name')) {
		if (url.match('form_name=mailinglist_email')) {
			var radio = document.getElementById('mail_pref_02');
		} else if (url.match('form_name=mailinglist_postal')) {
			var radio = document.getElementById('mail_pref_03');
		} else {
			var radio = document.getElementById('mail_pref_01');
		}
		radio.checked = true;
	} else { 
		document.getElementById('form_fields').style.display = 'none';
	}
}
form_mail_pref_redirect = function(target) {
	if (target) {
		window.location.href = target;
		document.getElementById('form_fields').style.display = 'block';
	}
}
window.onload = form_mail_pref;