a{ text-decoration: none; }

a:link
{
   color: black; text-decoration: none;
}

a:visited
{
   color: black; text-decoration: none;
}

a:hover
{
   color: black; text-decoration: underline; background-color:#ffff00;
}

a:active
{
   color: black; text-decoration: none; background-color:#ff0000;
}