OT:Javascript

Scuse me, but I don't know a good JavaScript ML.

In a form with a button I want open a Window, in this window I want manipulate variable of the form.

How I have to referrr to this variables ?

es

<form name=TESTFORM .........

<input type=button name=var1 ............ onClik=fun_Openw(TESTFORM)

JS

function fun_open {.............

window.open(.........