Popup window for product description/info
I would like to revise this by adding rel="popup">click here</a> so as to create the popup functionality as follows:
href="http://yarkansheli.com/index.php?main_page=product_info&cPath=2&products_id=28" rel="popup">click here</a>

A jscript_popup.js file is located at includes/templates/(mytemplate)/jscript…
Therefore, the popup functionality will load for the complete website as per requirement

Question:
Which PHP file do I require to edit and at which line?

Kindly advise,

Eran