jQuery Include Snippet

snippet.htm

<script>
  (function(){
    // Look for a jqversion query parameter and grab any following version.
    // Limit to digits and letters to prevent any XSS attempts
    var verMatch = /jqversion=([\w\.]+)/.exec( location.search ),
        // our matched version, e.g., 1.6.4 or 1.7rc1
        version = verMatch && verMatch[1],
        src;
    if ( version ) {
      // version was specified, use jQuery's CDN to acccess non-mininfied betas and RCs
      src = 'code.jquery.com/jquery-' + version;
    } else {
      // nothing was specified, use the Google CDN (or jQuery's or Microsoft's) with a minified copy
      src = 'ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min';
    }
    // create the script tag
    document.write( '<script src="//' + src + '.js"><\/script>' );
  })();
</script>
<script>
  // Use a local copy, incase the above didn't load
  if ( !window.jQuery ) {
    document.write( '<script src="/scripts/jquery-1.7.0.min.js"><\/script>' );
  }
</script>