clean up options code

js/treeview.js

@@ -16,8 +16,7 @@ $(function() {
 	if (window.Options && Options.get_tab('general')) {
 		var selector = '#treeview-global>input';
 		Options.extend_tab("general", "<label id='treeview-global'><input type='checkbox' /> "+_('Use tree view by default')+"</label>");
-	}
+		$(selector).on('change', function() {
-	$(selector).on('change', function () {
 			if (localStorage.treeview === 'true') {
 				localStorage.treeview = 'false';
 			} else {
@@ -27,6 +26,7 @@ $(function() {
 		if (localStorage.treeview === 'true') {
 			$(selector).attr('checked', 'checked');
 		}
+	}
 });
 
 if (active_page == 'thread')