you can use the following css definitions;
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That will make links you've already clicked on and just normal links pure white with no special features, underline, bold etc.
The code underneath it will change the colour for links when you hover over them with your mouse. In this case they will turn grey and will be underlined.
Of couse if you use that exact code then you can just add it in the links section of the body CSS at the top of the Main CSS page. If you want it just for a class you would put ".[your class] " before it. EG: ".[your class] a:link { color: #FFFFFF; }"