.a1 {color:#000000;text-decoration:none}
.a1:hover {color:#FF0000;text-decoration:underline}

.a2 {color:#000000;text-decoration:none}
.a2:hover {color:#CC0000;}

.a3 {color:#CC0000;text-decoration:none}
.a3:hover {color:#000000;}

.a4 {color:#FF0000;text-decoration:none}
.a4:hover {color:#FF0000;text-decoration:underline}