Here's an even better way to interface with TNT Australia for your tracking needs:
HTML Code:
{* $Id: tnt.tpl,v 1.1 2008/09/26 14:07:32 twice Exp $ *}
<form id="Tracking" name="Tracking" action="http://www.tntexpress.com.au/InterAction/ASPs/CnmHxAS.asp?{$order.tracking}" method="post" target="_blank">
<input type="submit" value="{$lng.lbl_track_it|strip_tags:false|escape}" />
<br />
{$lng.txt_tnt_redirection}
</form>
Nice and neat, and it returns ONLY the tracking information, without any other TNT web page clutter.
Dean