does anyone know how i could add a .js call to the header of my super_orders.php file in the admin section?

i want to put in a call to a new .js file, similar to the one in the header of the stats_sales_report.php file. something like this:

<script language="javascript" src="includes/javascript/spiffyCal/spiffyCal_v2_1.js"></script>

i'm trying to install a date search tool that has javascript calendar function and it's not working b/c i think the .js path is missing in the header.

thanks everyone

k-