Shoutbox

You should not use classes if that's not needed. Use a paragraph instead, like this

<p id="localhost">Hi i'm <a href="localhost">localhost</a></p>

Now your css would be like

p#localhost a:link, p#localhost a:visited
{
  text-decoration: none;
  color: #000;
}
p#localhost a:hover
{
  text-decoration: underline;
}