function $(id) {
	return document.getElementById(id);
}

function changeContent(subj) {
	switch(subj) {
		case 'wie_zijn_wij':
		case 'locatie':
		case 'links':
		case 'gastenboek':
			window.location = 'http://metdaffieopreis.nl/'+subj+'.php';
		break;
	}
}

function showSubMenu(id) {
	$(id+'_submenu').style.display = ($(id+'_submenu').style.display == 'none') ? 'block' : 'none';
	$(id+'_marker').innerHTML = ($(id+'_marker').innerHTML == '>') ? '<' : '>';
}

function validateGuestReaction() {
	reaction = createXMLHttpRequest();
	requestData(reaction, 'http://metdaffieopreis.nl/secure/handle_guestbook.php', 'action=add_reaction&name='+url_escape($('reaction_name').value)+'&url='+url_escape($('reaction_url').value)+'&email='+url_escape($('reaction_email').value)+'&content='+url_escape($('reaction_content').value), parseGuestReactionVerification, 'POST');
}

function parseGuestReactionVerification() {
	if (reaction.readyState == 4) {
		if (reaction.status == 200) {
			alert(reaction.responseText);
			if (reaction.responseText == 'Uw bericht is toegevoegd') window.location = 'http://metdaffieopreis.nl/gastenboek.php';
		}
	}
}