a.nav:link   { text-decoration: none; color: #000000 }
a.nav:visited { text-decoration: none; color: #000000 }
a.nav:hover  { text-decoration: underline; color: #000000 }
a.bas:link   { text-decoration: none; color: #333333 }
a.bas:visited { text-decoration: none; color: #333333 }
a.bas:hover  { text-decoration: underline; color: #333333 }
a.mar:link   { text-decoration: none; color: #666666 }
a.mar:visited { text-decoration: none; color: #666666 }
a.mar:hover  { text-decoration: underline; color: #666666 }