If you are talking about opening links in a new tab in a browser, not sure
how to go about that. However you can code links to open in a new window,
and perhaps if you play with that you can accomplish what you want.

Reference: Create a hyperlink in Publisher that opens in a new window:
http://office.microsoft.com/en-us/publisher/HA011587451033.aspx

And if you choose to use the ECMAScript code approach note that the first
javascript code snippet is incorrect on the website. Use this instead:

<script language="JavaScript" type="text/javascript">function Show(Url,
Name, Features) { window.open(Url, Name, Features); }</script>

DavidF