function topicURL(topic) {
	if(qs("age")) {
		return "/discovery/articles/?topic=" + topic + "&age=" + qs("age");
	} else {
		return "/discovery/articles/?topic=" + topic;
	}
}

function topicTitle(topic) {
	var title = topic.replace(/_/g," ");
	title = title.replace(/\b\w/g, function(){return arguments[0].toUpperCase();});
	return title;
}

function qs(str) {
	var url = document.location+"";
	url = unescape(url);
	if(url.indexOf(str+"=") == -1) { return false; }
	else {
		var val = url.split(str+"=");
		val = val[1].split("&");
		return val[0];
	}
}

function topicHeader() {
	var topic = qs("topic");
	if(topic) {
		document.write('<a href="'+topicURL(topic)+'"><h1>'+topicTitle(topic)+'</h1></a>');
	}
}