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diff --git a/kjs/function.h b/kjs/function.h
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+// -*- c-basic-offset: 2 -*-
+/*
+ *  This file is part of the KDE libraries
+ *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2003 Apple Computer, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef _KJS_FUNCTION_H_
+#define _KJS_FUNCTION_H_
+
+#include "object.h"
+
+namespace KJS {
+
+  class FunctionPrototypeImp;
+
+  /**
+   * Base class for all function objects.
+   * It implements the hasInstance method (for instanceof, which only applies to function objects)
+   * and allows to give the function a name, used in toString().
+   *
+   * Constructors and prototypes of internal objects (implemented in C++) directly inherit from this.
+   * FunctionImp also does, for functions implemented in JS.
+   */
+  class KJS_EXPORT InternalFunctionImp : public ObjectImp {
+  public:
+    /**
+     * Constructor. For C++-implemented functions, @p funcProto is usually
+     * static_cast<FunctionPrototypeImp*>(exec->interpreter()->builtinFunctionPrototype().imp())
+     */
+    InternalFunctionImp(FunctionPrototypeImp *funcProto);
+    InternalFunctionImp(ExecState *exec);
+
+    bool implementsHasInstance() const;
+    Boolean hasInstance(ExecState *exec, const Value &value);
+
+    virtual const ClassInfo *classInfo() const { return &info; }
+    static const ClassInfo info;
+    Identifier name() const { return ident; }
+    /// You might want to use the helper function ObjectImp::setFunctionName for this
+    void setName(Identifier _ident) { ident = _ident; }
+
+  protected:
+    Identifier ident;
+  };
+
+} // namespace
+
+#endif