AddRow Use Php Variable And Increase Every Time Add Row?

I have some code that I downloaded from the internet that shows you how to add a row to the bottom of your table by clicking a link. I have a PHP variable that counts the rows of the data that I currently have in my MySQL table and I want the variable to be grabbed by this javascript and every time I add a row it puts the number at the end of my name of my input statement (within the javascript) increased by 1.

Here's my php that gets my count of my rows

Code:

And here's the javascript to add a row

Code:

So to recap, I'm looking to somehow have the id="navpn1" and the name="navpn1" actually be navpn($CNTROWS +1) the first time I click the 'Add Row' link and then navpn($CNTROWS +2) and so on...