Adding a div tag within a div tag

I'm using Dreamweaver CS3 (but am really rusty).  I want to have a div tag that is 640 pixels in width and in the very centre of the screen at all times.  I also need to be able to insert sub-div tags, so that I can place specific images.

If you could give me some tips (or code), I'd really appreciate it.
Andy BrownDeveloperAsked:
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Here ya go, this should give you a good start.
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<meta http-equiv="content-type" content="text/html;charset=ISO-8859-1">
<title>Centered H and V</title> 
<style type="text/css" media="screen">
	font-family:Arial, Helvetica, sans-serif;
	position: absolute;
	top: 50%;
	left: 0px;
	width: 100%;
	margin-left: -320px;
	position: absolute;
	top: -240px;
	left: 50%;
	width: 640px;
	height: 480px;
	border:1px solid #ccc;
	/*Define your inner div's here*/
	<div id="container">
		<div id="content">
        	<div class="innerdiv">Put stuff in here</div> 	
        	<div class="innerdiv">Put stuff in here</div> 	
        	<div class="innerdiv">Put stuff in here</div> 	

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Andy BrownDeveloperAuthor Commented:
That's awesome - thank you.

Is it possible to add additional div tags within contect, so that I can position additional elements?

Thanks again - that's a great help.
Sure is, I added .innerdiv as an example.
Andy BrownDeveloperAuthor Commented:
I think I have it - can I draw the div tags manually and then set the CSS Style?
Andy BrownDeveloperAuthor Commented:
PS - Thanks again for all of the help.
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