Middle clock to close a tab

[Leo <sdl.web@xxxxxxxxx>]

Dear developers,

I have get used to middle click close a tab from Firefox. Now I try to
use emacs-w3m as my main browser. I am wondering how can I customize
emacs-w3m to achieve a similar functionality.

Thank you in advance.

-- 
Leo <sdl.web AT gmail.com>                         (GPG Key: 9283AA3F)