XHTML Transitional Validator problem

Hello. I'm not sure what is the problem but please check this link
I have strange error saying  that there is no alt tag.... i tried to remove
this link or add link before and validator moved this error to new links....
so only first link contain this error. 
Is it validor bug or i have soem problem with my code?
Sincerely, Dmitry

Received on Saturday, 22 April 2006 16:53:54 UTC