Запуск готового JavaScript-a из Visual C++

private: System::Void InjectJavascript(){
			 head=webBrowser1-> Document->GetElementsByTagName("head")[0];
             js=webBrowser1-> Document->CreateElement("script");
			 js->InnerText="alert('ok')";
			 head->AppendChild(js); 
		 }
private: System::Void webBrowser1_DocumentCompleted(System::Object^  sender, System::Windows::Forms::WebBrowserDocumentCompletedEventArgs^  e) {
          InjectJavascript();  
		 }