diff --git a/ext/bg/search.html b/ext/bg/search.html
index 2fd44fc7..b8ab21b0 100644
--- a/ext/bg/search.html
+++ b/ext/bg/search.html
@@ -34,6 +34,7 @@
 
         <script src="/mixed/lib/jquery-3.1.1.min.js"></script>
         <script src="/bg/js/util.js"></script>
+        <script src="/mixed/js/util.js"></script>
         <script src="/mixed/js/display.js"></script>
         <script src="/mixed/lib/wanakana.min.js"></script>
         <script src="/bg/js/display-window.js"></script>
diff --git a/ext/fg/frame.html b/ext/fg/frame.html
index 09d1689e..35bc0284 100644
--- a/ext/fg/frame.html
+++ b/ext/fg/frame.html
@@ -33,6 +33,7 @@
         <script src="/mixed/lib/jquery-3.1.1.min.js"></script>
         <script src="/mixed/lib/wanakana.min.js"></script>
         <script src="/fg/js/util.js"></script>
+        <script src="/mixed/js/util.js"></script>
         <script src="/mixed/js/display.js"></script>
         <script src="/fg/js/display-frame.js"></script>
     </body>
diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index c7f20a92..29a292c1 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -256,7 +256,7 @@ class Display {
         if (mode !== 'kanji') {
             const filename = Display.audioBuildFilename(definition);
             if (filename) {
-                promise = this.audioBuildUrl(definition).then(url => definition.audio = {url, filename}).catch(() => {});
+                promise = audioBuildUrl(definition, this.responseCache).then(url => definition.audio = {url, filename}).catch(() => {});
             }
         }
 
@@ -279,7 +279,7 @@ class Display {
             this.audioCache[key].pause();
         }
 
-        this.audioBuildUrl(definition).then(url => {
+        audioBuildUrl(definition, this.responseCache).then(url => {
             if (!url) {
                 url = '/mixed/mp3/button.mp3';
             }
@@ -302,78 +302,6 @@ class Display {
         }).catch(this.handleError.bind(this)).then(() => this.spinner.hide());
     }
 
-    audioBuildUrl(definition) {
-        return new Promise((resolve, reject) => {
-            const response = this.responseCache[definition.expression];
-            if (response) {
-                resolve(response);
-            } else {
-                const data = {
-                    post: 'dictionary_reference',
-                    match_type: 'exact',
-                    search_query: definition.expression
-                };
-
-                const params = [];
-                for (const key in data) {
-                    params.push(`${encodeURIComponent(key)}=${encodeURIComponent(data[key])}`);
-                }
-
-                const xhr = new XMLHttpRequest();
-                xhr.open('POST', 'https://www.japanesepod101.com/learningcenter/reference/dictionary_post');
-                xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
-                xhr.addEventListener('error', () => reject('failed to scrape audio data'));
-                xhr.addEventListener('load', () => {
-                    this.responseCache[definition.expression] = xhr.responseText;
-                    resolve(xhr.responseText);
-                });
-
-                xhr.send(params.join('&'));
-            }
-        }).then(response => {
-            const dom = new DOMParser().parseFromString(response, 'text/html');
-            const entries = [];
-
-            for (const row of dom.getElementsByClassName('dc-result-row')) {
-                try {
-                    const url = row.getElementsByClassName('ill-onebuttonplayer').item(0).getAttribute('data-url');
-                    const expression = row.getElementsByClassName('dc-vocab').item(0).innerText;
-                    const reading = row.getElementsByClassName('dc-vocab_kana').item(0).innerText;
-
-                    if (url && expression && reading) {
-                        entries.push({url, expression, reading});
-                    }
-                } catch (e) {
-                    // NOP
-                }
-            }
-
-            return entries;
-        }).then(entries => {
-            for (const entry of entries) {
-                if (!definition.reading || definition.reading === entry.reading) {
-                    return entry.url;
-                }
-            }
-        });
-    }
-
-    static audioBuildFilename(definition) {
-        if (!definition.reading && !definition.expression) {
-            return;
-        }
-
-        let filename = 'yomichan';
-        if (definition.reading) {
-            filename += `_${definition.reading}`;
-        }
-        if (definition.expression) {
-            filename += `_${definition.expression}`;
-        }
-
-        return filename += '.mp3';
-    }
-
     static entryIndexFind(element) {
         return $('.entry').index(element.closest('.entry'));
     }
diff --git a/ext/mixed/js/util.js b/ext/mixed/js/util.js
new file mode 100644
index 00000000..13f124a0
--- /dev/null
+++ b/ext/mixed/js/util.js
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2017  Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+/*
+ * Audio
+ */
+
+function audioBuildUrl(definition, cache) {
+    return new Promise((resolve, reject) => {
+        const response = cache[definition.expression];
+        if (response) {
+            resolve(response);
+        } else {
+            const data = {
+                post: 'dictionary_reference',
+                match_type: 'exact',
+                search_query: definition.expression
+            };
+
+            const params = [];
+            for (const key in data) {
+                params.push(`${encodeURIComponent(key)}=${encodeURIComponent(data[key])}`);
+            }
+
+            const xhr = new XMLHttpRequest();
+            xhr.open('POST', 'https://www.japanesepod101.com/learningcenter/reference/dictionary_post');
+            xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
+            xhr.addEventListener('error', () => reject('failed to scrape audio data'));
+            xhr.addEventListener('load', () => {
+                cache[definition.expression] = xhr.responseText;
+                resolve(xhr.responseText);
+            });
+
+            xhr.send(params.join('&'));
+        }
+    }).then(response => {
+        const dom = new DOMParser().parseFromString(response, 'text/html');
+        for (const row of dom.getElementsByClassName('dc-result-row')) {
+            try {
+                const url = row.getElementsByClassName('ill-onebuttonplayer').item(0).getAttribute('data-url');
+                const reading = row.getElementsByClassName('dc-vocab_kana').item(0).innerText;
+                if (url && reading && (!definition.reading || definition.reading === reading)) {
+                    return url;
+                }
+            } catch (e) {
+                // NOP
+            }
+        }
+    });
+}
+
+function audioBuildFilename(definition) {
+    if (definition.reading && definition.expression) {
+        let filename = 'yomichan';
+        if (definition.reading) {
+            filename += `_${definition.reading}`;
+        }
+        if (definition.expression) {
+            filename += `_${definition.expression}`;
+        }
+
+        return filename += '.mp3';
+    }
+}