You should be able to do what you want by using the class attribute on the links you wish to be a different colour e.g.
For the links at the top of the page:
.top a:link {text-decoration:none; color:#FFFFFF;}
.top a:hover {text-decoration:none; color:#FFCC33;}
.top a:visited {text-decoration:none; color:#FFFFFF;}
.top a:active {text-decoration:none; color:#FFFFFF;}
For the links on the rest of the site:
a:link {text-decoration:none; color:#FF0000;}
a:hover {text-decoration:none; color:#FFCC33;}
a:visited {text-decoration:none; color:#FF0000;}
a:active {text-decoration:none; color:#FF0000;}
In the html:
<a href="..." class="top">...</a> for the links at the top of the page
<a href="...">...</a> for the links on the rest of the site.