unable to pop to size from a submit function

Could someone take a look at this, I am unable to get it to pop instead it just goes target _blank

<script type="text/JavaScript">
<!--
function openWindow(theURL,winName,features) {
  window.open(theURL,winName,features);
}
//-->
</script>
</head>

echo "
<form action=confirm.php method=post id=popupWin target=formtarget onsubmit=openWindow('about:blank','formtarget','width=300,height=300')>

<input type=hidden name=target value='$target'>
<input type=hidden name=avatar value='$avatar'>
<input type=hidden name=person value='$person'>
</form>
<script type=text/javascript>
document.getElementById('popupWin').submit();
</script>
";

PHP:

EDIT I was going to delete this because I found my solution, but thought it might be helpful for others.

Forget about using a function, this was all I needed.

<form action=\"confirm.php\" method=\"post\" name=\"popupWin\" target=\"popupWin\">
<input type=hidden name=target value='$target'>
<input type=hidden name=avatar value='$avatar'>
<input type=hidden name=person value='$person'>
<script type=text/javascript>document.popupWin.submit(window.open('http://domainName.com/confirm.php','popupWin','width=450,height=300,status=yes,resizable=yes,scrollbars=yes'));</script>
</form>

PHP: