>That's great input.  Is there any way to increase accessibility without
>changing the colors.  Alt tags or the like?

Well, people that are blind (or close to it) are not effected, as they are 
using screen readers which really don't care about contrast. It effects people 
that have just normal vision problems but that can still see and use normal 
monitors. They may have color-blindness issues, fuzzy vision, doubled vision, 
any of a number of vision issues where low-contrast really can make things far 
more problematic. Or even just someone using a monitor with a low color 
resolution. Even people with normal vision will get more eye strain reading 
pages with low contrast. I know I personally have more issues with it than 
other people do, although in my case it just makes pages uncomfortable, but not 
impossible to read. I often will just drag my mouse over and select the text on 
the page to read it more comfortably. It's just basically not very 
user-friendly to assume that everyone can see with perfect vision, so ideally 
use text that is sufficiently different than your background colors. 

Here's more information and a quick page tester:

http://www.accesskeys.org/tools/color-contrast.html



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