Recently visited link

Hello

I have lots of links on my site and they all show correctly in the various states except for "Visited"

The code I put into ATO at Headline Box Links is below. It has had some effect on the titles of the posts but they do not show as having been "visited". I then noticed that none of the links on the site show this behaviour.
http://careersnews.ie/

What do I need to do to fix this?



Code used.
/* unvisited link */
a:link {
color: #FF0000;
}

/* visited link */
a:visited {
color: #00FF00;
}

/* mouse over link */
a:hover {
color: #FF00FF;
}

/* selected link */
a:active {
color: #0000FF;
}