Post Area divided in 3 pieces

[iogames.com]

I want to divide my 'Post Area' in 3 pieces to achieve 'style' or give a different look to my site:
I have seen websites like the one I need...
http://www.daniweb.com/forums/thread15536.html

here's a demo of what I want to achieve:



Thanks

[iogames.com]

Can someone meet me halfway...


<div id="posttop"></div>
<div id="postmiddle">$postmessage</div>
<div id="postbottom"></div>

[iogames.com]

Ok this is part of my postbit_legacy


<!-- message -->
<div id="post_message_$post[postid]">$post[message]</div>
<!-- / message -->