[SMARTY] Smarty vars - should I extend Smarty or set them after obj made?

Hi,

Should I extend the Smarty obj, and set Smarty vars like template dir  
that way (ex. $this->template_dir = 'templates';) or should I call a  
new Smarty obj, then set the vars? (ex. $page = new Smarty(); $page- 
 >template_dir = 'templates';)? What are the advantages/ 
disadvantages, if any?

Thanks!

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