Can i custimize the width, height, top and left of the thank you window?

And can i open it in a new windows?

I tried with this:

<>script type="text/javascript">
function createTarget(t){
window.open("", t, "width=400,height=150,top=200,left=200");
return true;
}
<>/script>

<>form id="Form1" name="Form1" method="post" action="formmail.php" onsubmit="return createTarget(this.target)" target="Thanks.html">
<>input type="hidden" name="redirect" value="Thanks.html">

In firefox works right. But in IE7, the new window open like normal windows (with toolbar, and big), not like i want (width=400,height=150,top=200,left=200)

Thanks.

PD: <> means just <, i put it, beacause this recognize html code and erase it.