Custom bbcode

[quitsmoking]

Can someone help me with this?
I need a custom bbcode (e.g. fullname) that works as follows:
- user clicks the bbcode icon, a popup window opens with a textbox and a button
- user types his name in the textbox and presses the button
- window disappears and the editor now has the bbcode's tag and the name value inside it (e.g. [fullname]John Smith[/fullname]).

Thank you.