When does a:focus apply? I thought that a link would have focus when the dotted box appears around a link in IE, like when a user tabs to the link using the keyboard. I've written my stylesheet like the following:

	a:link { color: #000; }
	a:visited { color: #696969; }
	a:hover { color: #696969; }
	a:active { color: #696969; }
	a:focus { color: red; }
I never seem to have red links. Any ideas?