Duplicate Multiple Table Rows For Form ?

I'm trying to work my way up to being a novice in Javascript but I'm not there quite yet.

My problem is that I want to create a form in which multiple form fields can be duplicated/deleted upon clicking a button. I have some javascript here that does exactly that, but it will only do it for one table row. This creates a problem since the form I want to duplicate would contain multiple rows.

I've tried containing everything in a nested table within the duplicatable row. That actually works, but it disables the delete function. Same goes for using a div.

Here's the javascript:

Code:

And here's the html:

Code: