Javascript window.open problem

Hi,

I have a problem with the folowing javascrpt.  The window opens to the 
correct size in Opera and IE, but full-screen in NN 4.6.  What it the matter? 
 

<a href="javascript:;" onClick="window.open('addressbook/index.php', 
'AddrBook', 'toolbar=no, location=no, status=yes, menubar=no, scrollbars=yes, 
resizable=yes, width=400, height=300')">Open your address book</a>

Or would you like to create an <a href="javascript:;" 
onClick="window.open('addressbook/acc_create.php', 'AddrBook', 'toolbar=no, 
location=no, status=yes, menubar=no, scrollbars=yes, resizable=yes, 
width=400, height=300')">address book</a>?

You can see it in situ at http://www.mapledesign.co.uk/sendcard/sendcard.php

TIA,
Peter.

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