GA Shortcode

gistfile1.php

function ga_func( $atts ) {

  extract( shortcode_atts(
		array("id" => "123" 
		), $atts )
	);

	return "<script type='text/javascript'>

  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', '".$id."']);
  _gaq.push(['_trackPageview']);

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();

</script>";

}
add_shortcode( 'customga', 'ga_func' );