diff --git a/static/index.html b/static/index.html
index 1c467ce..f1a99e0 100644
--- a/static/index.html
+++ b/static/index.html
@@ -26,10 +26,7 @@
     <script src="js/lib/leaflet.awesome-markers.js"></script>
     <script src="js/lib/moment.min.js"></script>
 
-    <!-- main module -->
-    <script src="js/main.js?v=1.0" type="module"></script>
-
-    <!-- no modules -->
-    <script src="js/bundle.js?v=1.0" nomodule></script>
+    <!-- bootstrap script -->
+    <script src="js/bootstrap.js"></script>
   </body>
 </html>
diff --git a/static/js/bootstrap.js b/static/js/bootstrap.js
new file mode 100644
index 0000000..4833fc6
--- /dev/null
+++ b/static/js/bootstrap.js
@@ -0,0 +1,16 @@
+(function(){
+  var s = document.createElement("script");
+
+  if (location.host === "127.0.0.1:8080") {
+    //dev
+    s.setAttribute("src", "js/main.js");
+    s.setAttribute("type", "module");
+
+  } else {
+    //prod
+    s.setAttribute("src", "js/bundle.js");
+
+  }
+
+  document.body.appendChild(s);
+})();