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Having parts of pages, like headers, footer, nav bars consistent throughout the site is good usability practice.
For the same picture you should use the same alt txt, as it's main function is to substitute the picture of users who can't or won't see the pictures.
Just avoid stuffing the alt txts with long winded lists of keywords, as that will have little to no effect, decrease the usability value, and make you a perfect target for the competition to file a Google Spam report.
I run 5 sites, and they rank well enough where I would be concerned to drop in rankings. But I put alt tags in several years ago and I made them different for each occurrence of the logo on each page of each site. So I guess I am afraid that it could be considered spam if I now change the logo alt tag on every page to the same phrase such as, "Company Name's Yummy Product" or
"Company Name's Certain Type of Service" as it would look like I am just putting the same name and keyword at the top of each page.
Then again, if I were Google, I would probably consider it spam if a site did the oppsoite and had a different alt tag for each occurrence of the same company logo on every page of the site (which is the way I have it now).
Will your alt tag assist your users this weekend? Or, are your alt tags a garish jumble of spider buffet keywords?
So, do you frantically want your graphics back, or are you feeling fairly comfortable with your alt tags?
So I could make the alt tag for each occurrence of the logo say "So and So's Service" as well.
Maybe I will try doing this on one site and see if it affects my ranking. Hopefully it won't mean much as the alt tag doesn't count for much as you said. Then I can have the proper alt tag to correcly describe the logo when it appears on every page.
Thanks for your help.