title: Unset key binding in emacs
body: <p>For example, in the codes of zen-coding, the "C-j" shadows the normal behavior of "C-j" (<code>newline-and-indent</code>)</p>
  
  <pre><code>(define-key zencoding-mode-keymap (kbd "C-j") 'zencoding-expand-line)
  </code></pre>
  
  <p>Then how can I unset this keybinding and use <code>C-j</code> for <code>newline-and-indent</code> again?</p>
  
  <p>I tried this, but it doesn't work:</p>
  
  <pre><code>(add-hook 'html-mode-hook
            (lambda ()
              (progn
                (zencoding-mode)
                (local-set-key (kbd "C-j") 'newline-and-indent))))
  </code></pre>
  
  <p>Does anyone have ideas about this?</p>