Opening a method=post in new window`

I have a game that loads through my site which they have to select a username to play. What I want, is so that when they hit the play button, it will open up the java game in a new window, with the window only the size of the game. I tried adding the target=”_blank” code a few places but it just messes things up. Here is what the code looks like:

[CODE]<form method=post action=acro.php>
Choose a Screen Name:
<input type=text name=name size=15>
<input type=submit value=”Play Acrophobia!”>
</form>[/CODE]

the acro.php file is the one I want to open in a new window the size of the game. Any help is greatly appreciated.

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