To set the initial tab that gets displayed to recommended products, in skin/smart_template/custom/tabs.tpl
Replace...
Code:
<li><a href="#st_tab5" rel="tcontent5"><span>{$lng.lbl_recommends}</span></a></li>
With...
Code:
<li class="selected"><a href="#st_tab5" rel="tcontent5"><span>{$lng.lbl_recommends}</span></a></li>
Then remove the class="selected" from the other tabs.
By default it's set to remember the last tab selected. You can disable that by editing skin/smart_template/custom/js/tabs/tabs.js
Change...
Code:
var enabletabpersistence=1
To...
Code:
var enabletabpersistence=0
HTH