That's not possible if it an <a> tag. At least not in Firefox.
Though you can use another thing like this...
[HTML]
<div onclick="window.location='nextpage.htm'" style="mouse:pointer;">Link Text</div>
<!--
instead of
-->
<a href="nextpage.htm">Link Text</a>[/HTML]
You can use
CSS's hover and active pseudo classes if you want it to look like a link.