diff -r 545803e685e0 -r 72d767c5142d client/annotviz/app/js/logger.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/client/annotviz/app/js/logger.js	Tue Jan 20 11:57:44 2015 +0100
@@ -0,0 +1,45 @@
+/**
+* js/wswrapper.js
+*
+* simple logger service
+*
+*/
+
+/* global document: false */
+
+'use strict';
+
+function HtmlLogger(doLog, container) {
+
+    var logContainer = container;
+    if(typeof(container) === 'string') {
+        logContainer = document.getElementById(container);
+    }
+    if(!doLog) {
+        document.body.removeChild(logContainer);
+        logContainer = undefined;
+    }
+
+
+    this.log = function(msg) {
+        if(doLog && logContainer) {
+            logContainer.innerHTML += msg + '\n';
+            logContainer.scrollTop = logContainer.scrollHeight;
+        }
+    };
+}
+
+function ConsoleLogger(doLog) {
+
+    this.log = function(msg) {
+        if(doLog) {
+            console.log(msg);
+        }
+    }
+
+}
+
+module.exports = {
+    HtmlLogger: HtmlLogger,
+    ConsoleLogger: ConsoleLogger
+};