diff --git a/script.js b/script.js
index 16c0391..b9b08b9 100644
--- a/script.js
+++ b/script.js
@@ -4,11 +4,31 @@ function changePDF(chapter) {
   document.getElementById("chapter_name").innerHTML = chapter
 }
 function onLoad() {
-  if (navigator.serviceWorker) {
-  navigator.serviceWorker.register('/sw.js').then(function(registration) {
-    console.log('ServiceWorker registration successful with scope:',  registration.scope);
-  }).catch(function(error) {
-    console.log('ServiceWorker registration failed:', error);
+  <script>
+  if ('serviceWorker' in navigator) {
+  window.addEventListener('load', function() {
+  navigator.serviceWorker.register('service-worker.js').then(function(registration) {
+  // Registration was successful
+  console.log('Registered!');
+  }, function(err) {
+  // registration failed :(
+  console.log('ServiceWorker registration failed: ', err);
+  }).catch(function(err) {
+  console.log(err);
   });
-}
+  });
+  } else {
+  console.log('service worker is not supported');
+  }
+  </script>
+// service-worker.js
+self.addEventListener('install', function() {
+  console.log('Install!');
+});
+self.addEventListener("activate", event => {
+  console.log('Activate!');
+});
+self.addEventListener('fetch', function(event) {
+  console.log('Fetch!', event.request);
+});
 }