Use the target attribute on the form, opening a window with
that name and your feature string in the onsubmit handler of the
FORM.
<form action=""
target="wndname" onsubmit="window.open('',this.target,'features');return true;">
http://www.htmlhelp.com/reference/html40/forms/form.html
The complete comp.lang.javascript FAQ is at
http://jibbering.com/faq/
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