Adding PHP and JavaScript to CMS page

[nbarnum]

I want to add a Constant Contact form to a CMS page.  My idea was to use Smarty to include the file with the javascript on it.

 

In the theme CMS tpl I'd add:

{if $cms->id == 45}
   {include file=".ccform.tpl"}
{/if}

Here's my question.  Is this a good way to do this?  Are there any concerns with doing it this way.  I've seen the category.tpl file work in a similar way including the product-sort.tpl and such.