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Does it valid if image link has null alt text?

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From: Jeevan Reddy
Date: Sep 7, 2010 5:58PM

Hi Friends,
Is it valid if image link has null alt text?
Scenario: i've a image link and has a text link adjacent to it pointing to
the same location.
so if i use same text adjacent to that image as alt text, same link be read
twice successively.
if i use same text as alt text and combined image and text together as
single link, it is some what ok, but same text read twice and become
redundant.
so i useded text and image together and has given null alt text(alt="").
here it work well as for as accessibility is concern.
Note: the images are not list items and i've couple of links like above in a
web page.
But my problem is As per SEO every image should have alt text, and links are
the main for Google indexing.
how does the above scenario effect on SEO?
Awaiting your reply.
Thanks and Regards,
Jeevan.