Circuit City Posts Narrower Loss  NEW YORK (Reuters) - Circuit City Stores Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CC.N target=/stocks/quickinfo/fullquote"&gt;CC.N&lt;/A&gt;, on  Friday reported a smaller quarterly loss as it kept a tight  rein on expenses and demand increased for digital televisions,  notebook computers and other popular products.