#window
<h1>
  <form action="" method="post" name="frm" onsubmit="addTest();return false;">
    <input type="text" name="test" id="test" />
    <input type="submit" />
  </form>
</h1>

<script type="text/javascript">
  function addTest(){
    //alert(document.forms[0].elements['test'].value);
    window.opener.document.forms[0].elements['js_return'].value = document.forms[0].elements['test'].value;
    self.close();
  }
</script>

#opener

<form action="#" method="post" />
<input id="js_return" name="caller" value="" />

<a href="#" onclick="showJs();return false;">Click here</a>
</form>
<script type="text/javascript">
  function showJs(){
    window.open("/toys/js", "js_window", "location=1");
  }
</script>