How to get value from popup to a hidden field in form

How to pass value from popup to a hidden field in form
Hi friend..
i new to javascript ..
i have problem ..
how to pass value from a pop window to a hidden field form..

here is the code..
for select.php

<script type=”text/javascript” >
function showdiv()
{

window.open(“future.html”,”Window1″,
“menubar=yes,width=430,height=360,toolbar=no,resize=yes”);
}
</script>
<form method=”get” action=””>

<select name=”forums[]” multiple=”multiple”>

<option value=”0001″>Forum 1</option>
<option value=”0025″>Forum 2</option>
<option value=”0027″>Forum 2</option>

</select>
<input type=”hidden” name=”attri” id=”attri” value=””>
<input type=”submit” name=”submit” value=”ok”>
<input type=”button” name=”future” value=”F” onclick=”showdiv()”/>
</form>

here is future.html

<div>
<form name=”att” >
<input type=”text” name=”future” id=”future” />
<input type=”submit” name=”fut” value=”ok” onclick=”getdata();return false;”>
</form>

</div>

i want to know
whatever value entered in popup text box .
onclick on submit button value should be writen or pass to
hidden field name of “attri” in select.php form.

please help me.

thnaks & regards
binay

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