To add javascript or CSS code to the script template you will need to enclose the code you add in {literal} {/literal} tags, otherwise you can receive an error from the template engine.
Your code to add will look like that:

{literal}
{* ------- your code to add here ------- *}
{/literal}

To add Google Analytics code you will need to edit the template file footer.html of your current template, and place the code in the manner explained above just before the tag.
For information how to edit a template file please see the article here. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!