A:link {text-decoration: none}
A:visited {text-decoration: none}
A:active {text-decoration: none}
A:hover {text-decoration: underline}

.class1 A:link {text-decoration: none}
.class1 A:visited {text-decoration: none}
.class1 A:active {text-decoration: none}
.class1 A:hover {text-decoration: none}