diff --git a/ts/domtools.classes.domtools.ts b/ts/domtools.classes.domtools.ts
index 51957b9..ba6f2a3 100644
--- a/ts/domtools.classes.domtools.ts
+++ b/ts/domtools.classes.domtools.ts
@@ -146,6 +146,21 @@ export class DomTools {
     this.elements.headElement.appendChild(styleElement);
   }
 
+  /**
+   * allows to set global styles
+   * @param stylesText the css text you want to set
+   */
+   public async setExternalScript(scriptLinkArg: string) {
+    await this.domReady.promise;
+    const done = plugins.smartpromise.defer();
+    const script = document.createElement('script')
+    script.src = scriptLinkArg;
+    script.addEventListener('load', function() {
+      done.resolve();
+    });
+    await done.promise;
+  }
+
   /**
    * allows setting external css files
    * @param cssLinkArg a url to an external stylesheet
diff --git a/ts/domtools.classes.keyboard.ts b/ts/domtools.classes.keyboard.ts
index 5bd0795..03c4bc3 100644
--- a/ts/domtools.classes.keyboard.ts
+++ b/ts/domtools.classes.keyboard.ts
@@ -174,10 +174,10 @@ export class Keyboard {
     this.pressedKeys.delete(event.keyCode);
   };
 
-  private areAllKeysPressed(combo: number[]) {
+  private areAllKeysPressed(keysArg: Key[]) {
     let result = true;
 
-    combo.forEach((key) => {
+    keysArg.forEach((key) => {
       if (!this.pressedKeys.has(key)) {
         result = false;
       }