Problem when EzStatic calls external HTML file which has JavaScript

Dear All,
I’m new to wordpress and your help is very much appreciated.

Goal – To call external html files inside WordPress – maintaining in a manned that template is maintained. The HTML file has JavaScript code.

Problem – The problem is that the javascript functions do not get executed when external HTML files are called by EzStatic. EzStatic works well when calling plain html files which do not have javascript.

Question –
1) Is there another way to do what Im trying to do i.e. call external html files which are in the same webserver, Maintaining the template style. These HTML files have javascript.

Thank you once again. Your help is very much appreciated.

Regards
Mark