Passing values between windows with javascript

I wonder if anyone can help

I have one form with

<form name="form1" action="form1.php" method="post">

on it I open a pop up window using

function MM_openBrWindow(theURL,winName,features) { //v2.0
window.open(theURL,winName,'resizeable=no,height=500,width=200');
}

which opens up another window

<form name="form2" action="form2.php" method="post">

I want to send some info from the pop up window into a text box on the form1.

Any ideas how to do this or if is possible doing something like

window.form1.textbox.value = "test"

To get aform entry on the parent window to be filled in you have to use the format:

opener.document.formName.formItem.value = whatever

I haven't really used this method before but that's what you do!

follow this excellent tutorial: http://www.wsabstract.com/javatutors/send1.shtml