firefox container problem

You’ve got some validation errors that may be causing problems – especially the missing start and end tags. You could also do with changing <div id="topcont"> to <div class="topcont">. There should only ever be 1 named id in a page, so if you intend to use something more than once, assign it a class – not an id.

In terms of the page background, I can’t see any difference between the display in FF3 and that in IE8.

if your talking about the grid type background, you need to change the css for the body background image from no-repeat to repeat-y.

viceng is right. You need to edit style.css (line 168)

#mainpage {
background-color:#FFFFCC;
background-image:url(http://www.sketchygrid.com/images/bg_2.png);
background-position:right top;
background-repeat:repeat-y;
border-right:1px solid #000000;
min-height:1000px;
padding:0 10px 10px;
width:100%;
}

and change background-repeat:no-repeat; to background-repeat:repeat-y;

I tried that originally and thought it wasn’t working. However, I’ve just pulled down a copy of the background image and I can see why. It’s an 800px high image – most of which is actually plain yellow. Not sure you’ll be happy with the result when you do get it tiling down the page.