a:link {text-decoration: none}
a:visited {text-decoration: none}
a:hover {text-decoration: underline}
a:active {text-decoration: none}
note the order is important!
<outertag ...class="somestyleclass">sometext<a class="somestyleclass" href=....>link text</a></outertag>
where outertag can be any HTML tag that encloses the <a> tag