Developing a simple Fckeditor plugin

i want to add a very simple plugin in my fck editor which will add a new button on my toolbar.I am using fck editor version 2.6.4 .This button when clicked will open a new window which will be having say two text fields.The new opened window will also be having an OK and cancel button.Also when i click on "Source" button i should see the code generated which i think will obviously be reflected. Plz help as i m a novice in this field??