Bobby Accessibility Error

Hello all,
 
I've stumbled across a strange Bobby error which I am not sure how to correct.  The problem being flagged is a client-side image map link without a text equivalent in the HTML.  This is a fair point, but I do have an alternative text link on the page.  The problem appears to be flagged because the link is a mailto rather than an http style link.  When I change both links to http://www.google.com Bobby doesn't report it as an error, but when I change it back to a mailto link the error is flagged again.  Does anyone know whether this is a problem with mailto or a problem with Bobby?
 
Thanks,
Dave.
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David Bacon
James Kelsey Design (JKD)
Westminster Business Square
1-45 Durham Street
London
SE11 5JH
Tel:  020 7793 9399
Fax: 020 7793 9299
web: www.jkd.co.uk <http://www.jkd.co.uk/> 
 
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