FCKEditor how to add a Toolbar Button ?

Question

Hello all readers.

I like to add a button on FCKEditor toolbar that will execute some JQuery code on Click event.

Is there any solution ?

What I like to do with that is the following:

I have create a database driven File System Manager that is build on ExtJS and CakePHP. Now on some other page I have create a form that use the FCKEditor and I Like to open with a Fancybox the page that hold the File System Manager, to allow the user to select the file that he like to use and then Copy file location.

Until now I do this work with a regular link, but I think is better and more professional to open the Fancybox with button from FCKEditor toolbar.

Anybody to help ?