diff --git a/public/js/ajax.js b/public/js/ajax.js
new file mode 100644
index 0000000..2af0bc0
--- /dev/null
+++ b/public/js/ajax.js
@@ -0,0 +1,19 @@
+"use strict";
+
+// https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest
+// https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest
+// r.addEventListener("progress", updateProgress, false);
+var Ajax = {
+  getJSON : function (url, onload) {
+    var r = new XMLHttpRequest();
+    r.open('GET', url, true);
+    r.setRequestHeader("Accept", "application/json");
+    r.setRequestHeader('X-Requested-With', 'XMLHttpRequest'); 
+    r.onreadystatechange = function () {
+      if (this.readyState == 4)
+	onload(JSON.parse(this.responseText));
+    };
+    r.send();
+  }
+};
+