Two minor issues

I have two issues I'd like some help with. The site address:
www.granatedit.com

ISSUE ONE
My site looks OK in IE 6, Opera 7, and NS 7, but in NS 7, the
div.maincontent doesn't completely render. I know I must be missing
something especially to satisfy that browser, but I don't know what it is.

Here's the style definition:

div.maincontent{
background-color: #000000;
border-bottom-color: #000000;
border-bottom-style: solid;
border-bottom-width: 5px;
width: 100%;
}


ISSUE TWO
I had to use a not-so-good way of getting the icons for W3C to appear at the
bottom of the left column. I put an inline style in the paragraph tag, but I
have to change it for each page by typing the correct number of units that
are required on that page. Is there another solution? I'm sure there is, but
I just don't know it and have worked far too long on this anyway.

Here's the code for that portion (for the index.html page):


<div class="menu"><br /><br />
<p class="copy" style="margin-top: 20em">
<a href="http://validator.w3.org/check/referer"><img src="w3c.gif"
alt="Valid XHTML 1.0" height="25" width="70" border="0" /></a><br />
<br />
<a href="http://validator.w3.org/check/referer"><img src="cssw3c.gif"
height="25" width="70" alt="Valid XHTML 1.0" border="0" /></a>

<br /> </p>
</div>
-----------------

COMMENT
Although many of my pages do not validate now (only three do), I am
anticipating the day when they all will and I'd love to be able to insert a
style that I don't have to tweak for each page.


Thanks in advance for any help!
--

Bonnie Granat
www.granatedit.com