a CSS file...having problems Options

[crazy_goat_black...]

i'm kind of new to CSS...so...yeah. and i'm having issues with my new template i'm making for the CSS reboot. the thing is, it looks absolutely perfect in internet explorer, but when i view it in firefox everything is screwed up! which obviously means there's something wrong with my code. anyone know what? i put it through the w3 validator but the report it gave me made no sense...

here it is:

CODE

<style type="text/css">

body
 {
 background:black;
 scrollbar-arrow-color:black;
 scrollbar-track-color:black;
 scrollbar-shadow-color:gray;
 scrollbar-face-color:orange;
 scrollbar-darkshadow-color:darkgray;
 scrollbar-highlight-color:lightgray;
 scrollbar-3dlight-color:orange;
font:12px Tw Cen MT white;
 }

a:link
 {
 font-color:blue;
 font:12px Tw Cen MT blue;
 font-size:12px;
 text-decoration:none;
 }

a:visited
{
font-color:blue;
font:12px Tw Cen MT blue;
font-size:12px;
text-decoration:none;
}

a:hover
{
font-color:mediumblue;
font:14px Tw Cen MT mediumblue;
font-size:15px;
text-decoration:italic;
cursor:crosshair;
background-color:black;
border:1px dashed orange;
}

#title
{
align:center;
height:50px;
width:550px;
font-color:white;
font:12px Tw Cen MT orange;
font-size:12px;
text-decoration:none;
background-color:#333333;
border:2px dashed orange;
}

#navigate
{
height:50px;
width:550px;
background-color:#000000;
}

#entry
{
align:center;
height:350px;
width:550px;
background-color:#222222;
border:2px dashed orange;
text-decoration:none;
}

#footer
{
align:center;
height:100px
width:550px;
background-color:#000000;
}
</style>


<!-- DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">

<head>
  <title>.:. Crazy Goat Design .:.</title>
</head>

<center>
<div id="title">
<center>
<font face="script mt bold" size="+3" color="orange">
<p>Crazy Goat Design</p>
</font>
<font face="trebuchet MS" size="+0" color="orange">
<p>"Let's all be goats in a field with no fences to keep us out of the Orchard."</p>
</font>
<p> </p>
</center>
</div>
</center>

<center>
<div id="navigate">
<center>
<font face="Trebuchet MS" color="white" size="-1">
<marquee>Brand new look + <a href="http://cssreboot.com" title="CSS Reboot">CSS Reboot</a> + Join the Reboot</marquee>
</font>
<font face="Trebuchet MS" color="white" size="+0">
+ <a href="http://www.diary-x.com" title="hostie">Diary X</a>
+ <a href="http://www.cafepress.com/uberfwuffwy" title="Uber Fwuffwy Store">Store</a>
+ <a href="http://s7.invisionfree.com/xblog" title="xBlog">xBlog</a>
+ <a href="http://www.xanga.com/crazzy_goat_layzz" title="Crazy Goat Xanga">Xanga</a>
+ <a href="mailto:crazygoat@diary-x.com" title="Email Us">Email</a>
+ <a href="http://www.createblog.com" title="Create Blog">Thanks</a>
+
</br>
</font>
</div>
</center>

<center>
<div id="entry">
<center>
<font face="trebuchet ms" size="+1" color="orange">
<p> </p>
<p>[Title]</p>
</font>
<font face="trebuchet ms" size="+0" color="orange">
<p>[date]</p>
</font>
<p>
<font face="Trebuchet MS" color="white" size="-1">
[body]
</font>
</p>
</center>
</div>
</center>

<center>
<div id="footer">
<center>
<font face="Trebuchet MS" color="white" size="-1">
<p>+ <a href="[prev url]" title="previous entry">Back</a> + Blackie typed at [time] + <a href="[next url]" title="next entry">Forth</a> +</p>
<p>© Crazy Goat Design 2005</p>
</font>
</center>

</html>

Help?

[talcumpowder]

Like Szeh said, don't double post.
And the only time I've seen that happen is when the div has overflow-y: auto; in it.... You can use 100%px for the height measurement and it works though... -isn't sure if that's valid-