10.13 - How do I POST a form to a new window?

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="" 
        method="post"
        target="wndname" 
        onsubmit="window.open('',this.target);return true;"
  >

• http://www.htmlhelp.com/reference/html40/forms/form.html