main.js: a bit more sane code

templates/themes/catalog/catalog.html

@@ -4,7 +4,8 @@
 <head>
 	<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
 	<script type='text/javascript'>
-		active_page = "catalog";
+		var active_page = "catalog"
+		  , board_name = "{{ board }}";
 	</script>
 	{% include 'header.html' %}
 	<title>{{ settings.title }}</title>