html to css

I am a self taught web-designer. I am in the process of integrating a website with a shopping cart. the problem is that i would like the shopping cart to look like the website.

shopsite is our cart provider. They told me i need to have a css to up load to have template to upload.

I am using dreamweaver to develop the html. I need help with converting the html into css. (not sure if this is the right terms. Can any one help me.

also i am not too sure how to integrate a css to an html so more than one page can register the changes or template.

Trying to add a proper top/bottom img to body section of site

I am trying to add an image to the top and bottom of my site that will round the corners of the navigation and body section of the page. The code below is not working so I am looking for some help. The css:

#templatemo_content {
	clear: both;
	float: left;
	margin: auto;
	background: url(images/templatemo_content_bg.jpg) repeat-y;
}
#templatemo_content_top {
	clear: both;
	float: left;
	width: 800px
	height: 25px
	margin: auto;
	background: url(images/templatemo_content_bg_top.png) no-repeat;
}
#templatemo_content_bottom {
	clear: both;
	float: left;
	width: 800px

Site check on portfolio

Hello,

I just completed the design to my new portfolio and
would like a critique.

Here is the site: www.rjrportfolio.com

The only issue I have is in Firefox 3.5.5 when you scroll
the CSS navigation which is "position:fixed;" does not
work.

I believe this site will also validate as XHTML 1.0 Strict as well.

Any feedback or suggestions would be greatly appreciated!

CSS Tabbed Content

Ok I dont exactly know how to classify this...

Tabbed content, All CSS, with image swapping..
I for some reason am missing something.

Here it is.

I am having trouble getting the "Tabs" to Switch to a "dark" for the Active tab.
Please Help...

Thanks in Advance

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
 
<!-- TABBED CSS BOXES -->

Changing background color issue

I have searched through books and forum posts, and tweaked my css code, and I still can't get the old background that I had previously on my css coding to update to a new plain background color. If someone could take a look at this and tell me what I'm doing wrong, that would be appreciated since I just can't seem to figure it out.

The background color I'm trying to get is: 0E131B. And as you can see, there is a gradiated background that goes from a black to a dark gray around the side bar and content sections. I don't know what I did, but I'm at a loss.

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