Possible bug?

Hello,

I am trying to validate my CSS, but I keep getting the following error:

*************************************************************


    Target: http://www.albertaandalusians.ca

Please, validate your XML document first!

Line 73

Column 21

The element type "img" must be terminated by the matching end-tag "</img>".

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However, I just validated my XHTML Transitional page not 5 minutes 
earlier.  Also, I've never heard of having to use a "</img>" tag.  Is 
the CSS validator requiring a stricter XHTML 1.0 compliancy than 
"Transitional"?

My CSS validates properly when I cut and paste it into the appropriate 
form on the validator page, but, of course, that won't work for my viewers.

My website can be found at:  http://www.albertaandalusians.ca/beta/index.php
My stylesheet can be found at: 
http://www.albertaandalusians.ca/beta/style.css

Thanks a bunch for any help you might have.

- Dylan