[assassingod]

You would using something like

PHP Code:

if ($action=="something")
{
$templatesused = "templatename";
include("global.php");
     if ($bbuserinfo[userid]==0) 
     {
          show_nopermission();
     }
        eval("\$variable = \"".gettemplate('templatename')."\";");
} 


Then use the link apage.php?action=something
also using $variable in the template and changing templatename to the new templte