CSS2 "Content"

I've been trying to use content in a division with an URI to a html 
file. Doesn't it work because Netscape 7.02 doesn't support it yet or 
because text/html doesn't work for this.
I used this code
<div class="GuestBook" style="content: 
url(http://aservice.awiebe.com/GuestBook-TPL/guestbook.html);">
</div>