Thnx for reply first of all,
Well what we are trying to do here is to change the pages from .html to .php extensions so we can add php to them anytime we needs to. One specific reasons to do this is to use <php include=”#”> tags. This will help us to shorten the code for future easy use i think. But what i do not know is, if we covert the pages to .php extension then as right now in the <nav> tags we have <active> tags to show on which page we are right now, but when we change and add whole nav to a another file & include it on the page, it will still have same <active> tag  on all pages for same option in nav. How can we make the navigation to determine on which page it is just all by itself & still having the navigation codes in another file and included to the page using <php include> tag
I even do not know if it is possible or not.
Regards