On some pages I have tables, some with dark backgrounds, some with light. I therefore need to have 2 link attributes on the same page. How do I do that.

For example: I have
a:link { text-decoration: none; font-family: verdana; font-size: 8pt; color: #FFFFFF }
a:visited { text-decoration: none; font-family: verdana; font-size: 8pt; color: #FFFF00 }

Links are light colored so for text in tables which have white as a background (on same page) these links do not show up as there is no contrast. How do I have 2 different link color attributes on same page? !

Thanks in advance for any help you can offer a newbie to CSS