How to insert javascript code

[fitgura]

Looks simple but I lost!

 

I would place a simple reveal.js code into my product page but I do not know how, and where to put it

<script type="text/javascript" src="jquery.reveal.js"></script>

I mean I uploaded the srcipt into the themes/prestashop/js folder, but how to link it correctly to show on product page

 

I think it would be okay in product.tpl but anywhere I link it, just happens nothing

 

Please help me!

 

Thank you

 

I use old PS 1.4.8.2