Window.close script doesn't seem to close
<p>Having trouble getting this code to actually close a window. Can anyone help? When the "return" is clicked it just goes to a blank page. </p>

<pre><code> &lt;form method="post" action="http://ww8.aitsafe.com/cf/add.cfm" target="newWindow" onsubmit="window.open('', 'newWindow','width=800,height=500,'+'scrollbars=yes,status=no,toolbar=no,menubar=no,top=200,left=200')"&gt;
&lt;p&gt;
&lt;input type="hidden" name="userid" value="A8403475"&gt;
&lt;input type="hidden" name="return" value="window.close"&gt;
&lt;input type="hidden" name="thumb" value="logo.png"&gt; 
&lt;select name="productpr"&gt;
&lt;option&gt;- Select Size -&lt;/option&gt;
&lt;option value="Size one:9.99"&gt;Size one - 9.99&lt;/option&gt;
&lt;option value="Size two:12.99"&gt;Size two - 12.99&lt;/option&gt;
&lt;/select&gt;
&lt;input type="submit" value="Add to Cart"&gt;
&lt;/p&gt;
&lt;/form&gt;
</code></pre>