diff --git a/test.html b/test.html
index c8951fc..bcf1c9f 100644
--- a/test.html
+++ b/test.html
@@ -4,6 +4,7 @@
 <meta charset="UTF-8" />
 <meta name="viewport" content="initial-scale=1,width=device-width" />
 <link rel="stylesheet" href="test.css" />
+<script type="text/javascript" src="test.js" />
 
 <!----------------------------------------------------------------------------->
 </head>
@@ -53,33 +54,5 @@
     </div>
 </div>
 
-<script>
-function check(tab) {
-    const tabs = tab.split('/')
-    let path = 'tab'
-    for (tab of tabs) {
-        path = `${path}/${tab}`
-        document.getElementById(path).checked = true
-    }
-}
-function push(tab) {
-    window.history.pushState(null, null, `?tab=${tab}`)
-}
-function update(id) {
-    const tab = id.split('/').slice(1).join('/')
-    push(tab)
-}
-function main() {
-    let tab = (new URL(document.location)).searchParams.get('tab')
-    if (tab) {
-        check(tab)
-    } else {
-        tab = '1/1'
-        check(tab)
-        push(tab)
-    }
-}
-</script>
-
 <!----------------------------------------------------------------------------->
 </main></body></html>
diff --git a/test.js b/test.js
new file mode 100644
index 0000000..ca31308
--- /dev/null
+++ b/test.js
@@ -0,0 +1,28 @@
+function check(tab) {
+    const tabs = tab.split('/')
+    let path = 'tab'
+    for (tab of tabs) {
+        path = `${path}/${tab}`
+        document.getElementById(path).checked = true
+    }
+}
+
+function push(tab) {
+    window.history.pushState(null, null, `?tab=${tab}`)
+}
+
+function update(id) {
+    const tab = id.split('/').slice(1).join('/')
+    push(tab)
+}
+
+function main() {
+    let tab = (new URL(document.location)).searchParams.get('tab')
+    if (tab) {
+        check(tab)
+    } else {
+        tab = '1/1'
+        check(tab)
+        push(tab)
+    }
+}