JavaScript parameter @ Link-Manager Blogroll?

Hi,
is there a way to add the JavaScript window.open parameter into a link at the Link-Manager mask? I’d like to have something like

<a href="http://www.christopherherz.de/gallery/sv-24h-nuerburgring-2006/index.html" onclick="OpenGallery(this.href); return false">Link</a>

Of course I have the script definition <script…> </script> implemented in the page, where the link will be added.

There are only specific parameters you can add like target or ref