[How To?] Reset the thread link color when a new post is made in a visited thread?

[luis1972]

So, I have this on my global.css:

a:link {
	color: #C80000 ;
	text-decoration: bold;
}

a:visited {
	color: #909090 ;
	text-decoration: none;

Which uses the exact color scheme I want. The problem is my posters have trouble differentiating between visited threads with no new posts and visited threads with new posts. The only difference is that the ones with new posts have the thread title bolded, but the link color stays the same. Is there a way to reset a visited thread to use the a:link scheme whenever a new post is made in the thread?

Sorry if this is a simple question. And thanks for the help in advance.