diff --git a/src/main/resources/org/jenkinsci/plugins/managedscripts/ScriptConfig/edit-config-codemirror.js b/src/main/resources/org/jenkinsci/plugins/managedscripts/ScriptConfig/edit-config-codemirror.js
new file mode 100644
index 0000000..8e664a3
--- /dev/null
+++ b/src/main/resources/org/jenkinsci/plugins/managedscripts/ScriptConfig/edit-config-codemirror.js
@@ -0,0 +1,27 @@
+document.onreadystatechange = function(){
+    // editor.on seems to require newer codemirror version
+    // var pending;
+    // editor.on("change", function() {
+    //      clearTimeout(pending);
+    //      pending = setTimeout(update, 400);
+    //  });
+    function looksLike(code) {
+        var firstline = code.split('\n')[0];
+        if(firstline.indexOf('#!') == 0){
+            var shellpattern = /bin\/[\w]{0,2}sh/;
+            var shellpatternwin = /[\w]{0,2}sh\.exe/;
+            if(firstline.indexOf('python') > -1){
+                return "python";
+                // perl requires stapler-adjunct-codemirror > 1.3
+            }else if(firstline.indexOf('perl') > -1){
+                return "perl";
+            }else if(shellpattern.exec(firstline) || shellpatternwin.exec(firstline)){
+                return "shell";
+            }
+        }
+    }
+    function update() {
+        editor.setOption("mode", looksLike(editor.getValue()));
+    }
+    update();
+};
diff --git a/src/main/resources/org/jenkinsci/plugins/managedscripts/ScriptConfig/edit-config.jelly b/src/main/resources/org/jenkinsci/plugins/managedscripts/ScriptConfig/edit-config.jelly
index 9590573..480bb51 100644
--- a/src/main/resources/org/jenkinsci/plugins/managedscripts/ScriptConfig/edit-config.jelly
+++ b/src/main/resources/org/jenkinsci/plugins/managedscripts/ScriptConfig/edit-config.jelly
@@ -55,34 +55,6 @@ THE SOFTWARE.
                             org.kohsuke.stapler.codemirror.mode.shell.shell,
                             org.kohsuke.stapler.codemirror.mode.perl.perl,
                             "/>
-        <script>
-            document.onreadystatechange = function(){
-                // editor.on seems to require newer codemirror version
-                // var pending;
-                // editor.on("change", function() {
-                //      clearTimeout(pending);
-                //      pending = setTimeout(update, 400);
-                //  });
-                function looksLike(code) {
-                    var firstline = code.split('\n')[0];
-                    if(firstline.indexOf('#!') == 0){
-                        var shellpattern = /bin\/[\w]{0,2}sh/;
-                        var shellpatternwin = /[\w]{0,2}sh\.exe/;
-                        if(firstline.indexOf('python') > -1){
-                            return "python";
-                        // perl requires stapler-adjunct-codemirror > 1.3
-                        }else if(firstline.indexOf('perl') > -1){
-                            return "perl";
-                        }else if(shellpattern.exec(firstline) || shellpatternwin.exec(firstline)){
-                            return "shell";
-                        }
-                    }
-                }
-                function update() {
-                    editor.setOption("mode", looksLike(editor.getValue()));
-                }
-                update();
-            };
-        </script>
+        <st:adjunct includes="org.jenkinsci.plugins.managedscripts.ScriptConfig.edit-config-codemirror"/>
     </f:entry>
 </j:jelly>
\ No newline at end of file