diff --git a/src/commands.hxx b/src/commands.hxx
index 35ebb29..a4888c2 100644
--- a/src/commands.hxx
+++ b/src/commands.hxx
@@ -32,6 +32,7 @@
 
 class Script;
 class Command;
+class Function;
 
 class Logger {
   public:
@@ -121,7 +122,20 @@ class Command: public QObject {
       while (QTime::currentTime()<dieTime)
         QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
     }
-  public:
+  protected:
+    QStringList commaSeparatedList(QString value) {
+      switch (value.size()>1&&value.at(0)==value.at(value.size()-1)
+              ?value.at(0).toLatin1():'\0') {
+        case '"': case '\'': {
+          return value.mid(1, value.size()-2)
+            .split(QRegularExpression(QString(value[0])+", *"
+                                      +QString(value[0])));
+        } break;
+        default: {
+          return value.split(QRegularExpression(", *"));
+        }
+      }
+    }
     static QWebElement find(QWebFrame* frame, QString selector,
                             int repeat = 2, int sleepsec = 1) {
       QWebElement element;
@@ -418,6 +432,7 @@ class Script: public QObject {
       reset();
       _variables.clear();
       _rvariables.clear();
+      _functions.clear();
       _timeout = 20;
       _clicktype = JAVASCRIPT_CLICK;
     }
@@ -609,10 +624,29 @@ class Script: public QObject {
       _variables[name] = value;
       _rvariables[value] = name;
     }
+    void set(const Script& o) {
+      _variables = o._variables;
+      _rvariables = o._rvariables;
+      _timeout = o._timeout;
+      _clicktype = o._clicktype;
+      _cout.clear();
+      _cerr.clear();
+      _ignoreSignalsUntil.clear();
+      _functions.clear();
+    }
     void unset(QString name) {
       _rvariables.remove(_variables[name]);
       _variables.remove(name);
     }
+    void function(QString name, std::shared_ptr<Function> f) {
+      _functions[name] = f;
+    }
+    std::shared_ptr<Function> function(QString name) {
+      QMap<QString, std::shared_ptr<Function> >::iterator
+        it(_functions.find(name));
+      if (it==_functions.end()) throw FunctionNotFound(name);
+      return *it;
+    }
     void timeout(int t) {
       _timeout = t;
     }
@@ -637,24 +671,6 @@ class Script: public QObject {
       }
       return txt;
     }
-  public Q_SLOTS:
-    void log(QString text) {
-      text = QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss ")+text;
-      logging(text);
-      std::cout<<text<<std::endl<<std::flush;
-      _cout += text + "\n";
-    }
-    void plainlog(QString text) {
-      logging(text);
-      std::cout<<text<<std::endl<<std::flush;
-      _cout += text + "\n";
-    }
-  private:
-    std::shared_ptr<Command> unknown(QString line) {
-      if (!line.size()) return std::shared_ptr<Command>(new Empty());
-      if (line[0]=='#') return std::shared_ptr<Command>(new Comment(line));
-      throw UnknownCommand(line); // error
-    }
     void addSignals(QWebFrame* frame) {
       connect(dynamic_cast<NetworkAccessManager*>
               (frame->page()->networkAccessManager()),
@@ -703,6 +719,24 @@ class Script: public QObject {
                  this, SLOT(urlChanged(const QUrl&)));
       disconnect(&_timer, SIGNAL(timeout()), this, SLOT(timeout()));
     }
+  public Q_SLOTS:
+    void log(QString text) {
+      text = QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss ")+text;
+      logging(text);
+      std::cout<<text<<std::endl<<std::flush;
+      _cout += text + "\n";
+    }
+    void plainlog(QString text) {
+      logging(text);
+      std::cout<<text<<std::endl<<std::flush;
+      _cout += text + "\n";
+    }
+  private:
+    std::shared_ptr<Command> unknown(QString line) {
+      if (!line.size()) return std::shared_ptr<Command>(new Empty());
+      if (line[0]=='#') return std::shared_ptr<Command>(new Comment(line));
+      throw UnknownCommand(line); // error
+    }
     void initPrototypes();
     void add(Command* c) {
       _prototypes[c->tag()] = std::shared_ptr<Command>(c);
@@ -774,6 +808,7 @@ class Script: public QObject {
     QString _ignoreSignalsUntil;
     QMap<QString, QString> _variables; ///< variable mapping
     QMap<LenString, LenString> _rvariables; ///< reverse variable mapping
+    QMap<QString, std::shared_ptr<Function> > _functions;
     int _timeout;
     ClickType _clicktype;
 };
@@ -1217,7 +1252,7 @@ class Execute: public Command {
     }
     QString description() const {
       return
-        tag()+" <command>\n  <line1>\n  <line2>\n <...>"
+        tag()+" <command>\n  <line1>\n  <line2>\n  <...>"
         "\n\n"
         "Execute <command>. The command can have space separated arguments. "
         "Following lines that are intended by at least "
@@ -1416,7 +1451,8 @@ class Set: public Command {
         "Sets the value of a variable either to a constant, or to the output"
         " of a command. A command should be a command that produces an"
         " output, such as «do», which returns the result of JavaScript or"
-        " «execute», which returns the output of the executed command.";
+        " «execute», which returns the output of the executed command."
+        " All variables are global with regrad to functions.";
     }
     QString command() const {
       if (_next)
@@ -1663,7 +1699,7 @@ class SetValue: public Command {
     QString description() const {
       return
         tag()+" <selector> -> '<value>'\n"+
-        tag()+" <selector> -> '<value1>', '<value2>', ..."
+        tag()+" <selector> -> '<value1>', '<value2>', <...>"
         "\n\n"
         "Set the selected element to a given value. It is mostly the same as"
         " the following constuct, except that options in a select are evaluated"
@@ -1697,18 +1733,7 @@ class SetValue: public Command {
       QString value(script->replacevars(_value));
       if (element.tagName()=="SELECT") {
         // value is a comma seperated list of option values
-        QStringList values;
-        switch (value.size()>1&&value.at(0)==value.at(value.size()-1)
-                ?value.at(0).toLatin1():'\0') {
-          case '"': case '\'': {
-            values = value.mid(1, value.size()-2)
-              .split(QRegularExpression(QString(value[0])+", *"
-                                        +QString(value[0])));
-          } break;
-          default: {
-            values = value.split(QRegularExpression(", *"));
-          }
-        }
+        QStringList values(commaSeparatedList(value));
         Q_FOREACH(QWebElement option, element.findAll("option")) {
           QString name(option.evaluateJavaScript("this.value").toString());
           option.evaluateJavaScript
@@ -1730,6 +1755,120 @@ class SetValue: public Command {
     QString _value;
 };
 
+class Function: public Command {
+  public:
+    QString tag() const {
+      return "function";
+    }
+    QString description() const {
+      return
+        tag()+" <name> [<var1>, <var2>, <...>]\n"
+        "  <command1>\n"
+        "  <command2>\n"
+        "  <...>\n"
+        "\n\n"
+        "Define a function with arguments. The arguments are treated like"
+        " local variables. In a sequence of scripts within the same testrun,"
+        " functions are inherited from all followin scripts, so you can first"
+        " load a script file that contains all functions. Within the same file,"
+        " a function can be called before the definition.\n\n"
+        "If you quote the values, then quote all values with the same"
+        " quotes. If you need a comma within a value, you must quote.";
+    }
+    QString command() const {
+      return tag()+" "+_name+" "+_vars.join(" ");
+    }
+    std::shared_ptr<Command> parse(Script* script, QString args,
+                                   QStringList& in, int) {
+      std::shared_ptr<Function> cmd(new Function());
+      if (!args.size()) throw BadArgument(tag()+" requires a <name>");
+      QStringList allargs(args.split(" "));
+      cmd->_name = allargs.takeFirst().trimmed();
+      cmd->_vars = commaSeparatedList(allargs.join(' '));
+      script->function(cmd->_name, cmd);
+      QStringList commands;
+      int pos(-1);
+      while (in.size() && in[0].size() && in[0][0]==' ') {
+        if (pos<0) pos=in[0].toStdString().find_first_not_of(' ');
+        commands += in.takeFirst().mid(pos);
+      }
+      cmd->_script = std::shared_ptr<Script>(new Script);
+      cmd->_script->parse(commands);
+      return cmd;
+    }
+    bool execute(Script* script, QWebFrame*) {
+      Logger log(this, script);
+      return true;
+    }
+    bool call(QStringList args, Script* script, QWebFrame* frame) {
+      Logger log(this, script);
+      if (args.size()!=_vars.size())
+        throw WrongNumberOfArguments(_name, _vars, args);
+      xml::Node suite("testcase");
+      suite.attr("classname") = _name.toStdString();
+      suite.attr("name") = testsuite().toStdString();
+      _script->set(*script);
+      for (QStringList::iterator var(_vars.begin()), arg(args.begin());
+           var<_vars.end() && arg<args.end(); ++var, ++arg)
+        _script->set(*var, script->replacevars(*arg));
+      try {
+        connect(_script.get(), SIGNAL(logging(QString)),
+                script, SLOT(log(QString)));
+        script->removeSignals(frame);
+        _script->run(frame, suite, targetdir());
+        script->addSignals(frame);
+        disconnect(_script.get(), SIGNAL(logging(QString)),
+                   script, SLOT(log(QString)));
+      } catch (const std::exception& x) {
+        script->addSignals(frame);
+        disconnect(_script.get(), SIGNAL(logging(QString)),
+                   script, SLOT(log(QString)));
+        throw FunctionCallFailed(_name, _vars, args, x);
+      }
+      return true;
+    }
+  private:
+    QString _name;
+    QStringList _vars;
+    std::shared_ptr<Script> _script;
+};
+
+class Call: public Command {
+  public:
+    QString tag() const {
+      return "call";
+    }
+    QString description() const {
+      return
+        tag()+" <name> ['<arg1>', '<arg2>', ...]"
+        "\n\n"
+        "Calls a function. The number of arguments must be exactly the same"
+        " as in the function definition.\n\n"
+        "If you quote the values, then quote all values with the same"
+        " quotes. If you need a comma within a value, you must quote.";
+    }
+    QString command() const {
+      return tag()+" "+_name+(_args.size()?" '"+_args.join("', '")+"'":"");
+    }
+    std::shared_ptr<Command> parse(Script*, QString args,
+                                   QStringList&, int) {
+      std::shared_ptr<Call> cmd(new Call());
+      if (!args.size()) throw BadArgument(tag()+" requires a <name>");
+      QStringList allargs(args.split(" "));
+      cmd->_name = allargs.takeFirst().trimmed();
+      cmd->_args = commaSeparatedList(allargs.join(' '));
+      return cmd;
+    }
+    bool execute(Script* script, QWebFrame* frame) {
+      Logger log(this, script);
+      script->function(_name)->call(_args, script, frame);
+      return true;
+    }
+  public:
+    QString _name;
+    QStringList _args;
+};
+
 /* Template:
 class : public Command {
   public:
@@ -1746,7 +1885,7 @@ class : public Command {
       return tag();
     }
     std::shared_ptr<Command> parse(Script*, QString args,
-                                   QStringList& in, int) {
+                                   QStringList&, int) {
       std::shared_ptr<> cmd(new ());
       return cmd;
     }
@@ -1809,6 +1948,8 @@ inline void Script::initPrototypes() {
   add(new ClientCertificate);
   add(new ::ClickType);
   add(new SetValue);
+  add(new Function);
+  add(new Call);
 }
 
 #endif
diff --git a/src/exceptions.hxx b/src/exceptions.hxx
index 31fcd1c..5e56d23 100644
--- a/src/exceptions.hxx
+++ b/src/exceptions.hxx
@@ -219,4 +219,31 @@ class ScriptExecutionFailed: public ScriptFailed {
     }
 };
 
+class WrongNumberOfArguments: public TestFailed {
+  public:
+    WrongNumberOfArguments(QString name, QStringList vars, QStringList args):
+        TestFailed(QString("%1 has %2 arguments, but %3 were given")
+                   .arg(name).arg(vars.size()).arg(args.size())) {
+    }
+};
+
+class FunctionCallFailed: public TestFailed {
+  public:
+    FunctionCallFailed(QString name, QStringList vars, QStringList args,
+                       const std::exception& x):
+        TestFailed("function call failed: "+name) {
+        for (QStringList::iterator var(vars.begin()), arg(args.begin());
+             var<vars.end() && arg<args.end(); ++var, ++arg)
+          _what += " "+*var+"="+*arg;
+        _what += QString("; reason: ")+x.what();
+    }
+};
+
+class FunctionNotFound: public TestFailed {
+  public:
+    FunctionNotFound(QString name):
+        TestFailed("function not found: "+name) {
+    }
+};
+
 #endif
diff --git a/src/testgui.hxx b/src/testgui.hxx
index a96d563..bfaad67 100644
--- a/src/testgui.hxx
+++ b/src/testgui.hxx
@@ -269,7 +269,7 @@ class TestGUI: public QMainWindow, protected Ui::TestGUI {
       int pos1(text.lastIndexOf(QRegularExpression("^do ")));
       int pos2(text.lastIndexOf(QRegularExpression("^load ")));
       int pos3(text.lastIndexOf(QRegularExpression("^click ")));
-      text.insert(mrw::max(pos1, pos2, pos3), "download "+filename);
+      text.insert(std::max({pos1, pos2, pos3}), "download "+filename);
       _testscript->setPlainText(text);
       _testscript->moveCursor(QTextCursor::End);
       _testscript->ensureCursorVisible();