new file mode 100644
--- /dev/null
+++ b/mam.js
@@ -0,0 +1,61 @@
+'use strict';
+
+function initMAM(connection) {
+    const prefs_default = document.getElementById('mam-default');
+    const prefs_spinner = document.getElementById('mam-prefs-spinner');
+
+    const iq = $iq({type: 'get'})
+        .c('prefs', {xmlns: NS.mam});
+    connection.sendIQ(iq, onMAMPrefs, onMAMPrefsError.bind(null, 'query failed.'));
+
+    function onMAMPrefs(result_iq)
+    {
+        const prefs = parseXPath(result_iq, './mam:prefs');
+        if (prefs == null)
+            return onMAMPrefsError('server error.');
+        const default_ = prefs.getAttributeNS(null, 'default');
+        prefs_default.value = default_;
+        const always = parseXPath(prefs, './mam:always/mam:jid', XPathResult.ORDERED_NODE_ITERATOR_TYPE);
+        while (true) {
+            const item = always.iterateNext();
+            if (!item)
+                break;
+            const jid = item.textContent;
+            console.log(jid);
+        }
+        const never = parseXPath(prefs, './mam:never/mam:jid', XPathResult.ORDERED_NODE_ITERATOR_TYPE);
+        while (true) {
+            const item = never.iterateNext();
+            if (!item)
+                break;
+            const jid = item.textContent;
+            console.log(jid);
+        }
+    }
+
+    function onMAMPrefsError(string)
+    {
+        console.log('Failed to retrieve your message archiving preferences: ' + string);
+    }
+
+    prefs_default.addEventListener('change', function (evt) {
+        const value = evt.target.value;
+
+        const iq = $iq({type: 'set'})
+            .c('prefs', {xmlns: NS.mam, 'default': prefs_default.value});
+        connection.sendIQ(iq, onPrefsSet, onPrefsError);
+        displaySpinner(prefs_spinner);
+    });
+
+    function onPrefsSet(iq)
+    {
+        console.log('MAM preferences successfully updated.');
+        spinnerOk(prefs_spinner);
+    }
+
+    function onPrefsError(iq)
+    {
+        console.log('Error while changing MAM preferences.');
+        spinnerError(prefs_spinner);
+    }
+}