SyntaxHighlighter is great little library that seamlessly takes care of – you guessed it – code syntax highlighting on your website. As a standalone JS library, it’s platform agnostic and will work on any web publishing system, and this includes SquareSpace. Installation only takes a couple of minutes:

• Download SyntaxHighlighter
• Use SS’ Code Injection  feature to include the required script and link tags 

  <script type="text/javascript" src="storage/scripts/shCore.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushBash.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushCpp.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushCSharp.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushCss.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushDelphi.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushDiff.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushGroovy.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushJava.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushJScript.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushPhp.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushPlain.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushPython.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushRuby.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushScala.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushSql.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushVb.js"></script>
  <script type="text/javascript" src="storage/scripts/shBrushXml.js"></script>
  <link type="text/css" rel="stylesheet" href="storage/styles/shCore.css"/>
  <link type="text/css" rel="stylesheet" href="storage/styles/shThemeDefault.css"/>
  <script type="text/javascript">
  SyntaxHighlighter.config.clipboardSwf = 'storage/scripts/clipboard.swf';
  SyntaxHighlighter.all();
  </script>
  

• Surround the code you want to highlight in your blog posts with pre tags, with the appropriate brush in the class attribute

  <pre class="brush: js">
  function somePrettyFunction(params) {
  return "Lorem";
  }
  </pre>

/thx Weston Binford