jQuery Syntax Highlighter

 JavaScript Syntax Highlighter can be used for client-side syntax highlighting
 of following languages: HTML, CSS, JavaScript, PHP, SQL, HTTP and SMTP
 protocol, php.ini and Apache config.
 .
 Features:
 .
  * Highlights languages embedded into each other
  * Links to documentation of all languages
  * Colors can be easily modified via CSS
  * Recognizes complete PHP syntax including __halt_compiler, heredoc,
    backticks, {$} variables inside strings, namespaces
  * Works in all major browsers including Internet Explorer, Firefox, Opera,
    Google Chrome