Another Works IE; FF 100% height Fails

Basically it works fine in IE but in FF the scroll bar doesnt show up and it just forces everything down. Theres a scroll bar in a div tag in the middle of the table.

<!-- Copyright ©2006 Templarian, CMS -->
<title>Templarian Content Management System</title>
<style type="text/css">
body,html{margin:0px;width:100%;height:100%;font-family:Trebuchet MS, Tahoma, Arial, Helvetica, sans-serif;overflow:hidden;}
<table id="t_main" cellpadding="0" cellspacing="0">
<td id="t_top">Menu</td>
<div id="t_middle">
1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1<br />1
<td id="t_bottom" class="clear">Copyright 2006 Templarian</td>


(The real version is a built into a CMS so I can’t really post it if no ones able to answer then i will make up a test version.)