a.x:link, a.x:visited  { text-decoration: underline; }
a.x:hover  { text-decoration: none; }
a.y:link, a.y:visited  { text-decoration: none; }
a.y:hover  { text-decoration: underline; }
a.z:link, a.z:visited  { color: #FF0000; }
a.z:hover  { color: #FF0000; background: #FFFF00; }