Hover States for links

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I am currently creating a <!-- m --><a class="postlink" href="http://www.moemar.com/sitehub/genovese">http://www.moemar.com/sitehub/genovese</a><!-- m --> using CSS and I am attempting to create a specific hover state with the links ONLY in the navigation bar. I want only those links to have a lighter blue background when the user hovers. While the other links throughout the page react normally. The question is; how do I designate actions to specific links only?#seperator a:hover { /* desired effect */ }