How to determine stage focus

I have two input text fields and I want the user to be able to enter data into either one of them and have the other update with the same information. I am trying to set up an if statement that looks for the current textfield like this:
if (CURRENT TEXTFIELD == box1){
but I don't know how to detect the current textfield.
Can anyone tell me the proper code for "CURRENT TEXTFIELD"?

This is what I tried.
var currentBox = event.target.name;
if (currentBox == "box1" ){
box2.text = box1.text;
I traced the event.target.name and got "instance12" back even though I set the instance name to be "box1". Why is that?

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I searched through many forums (js of course too) but
I couldn�t find a solution. Everybody knows how to
set the focus but not how to get it. We often use
JSF/JSP with javascript and maybe somebody here has
another approach to this problem (how to solve it
using jsf itself or anything else)?Take easy. I just suggested to search in a JavaScript forum , in your question you didn't mentioned this. Good luck man.
Cya.

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