RE: Need help with attributes

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http://forums.oscommerce.com/viewtopic.php?p=227715#227715
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Change:

[code]    function display_price($products_price, $products_tax, $quantity = 1) { 
      return $this->format(tep_add_tax($products_price, $products_tax) * $quantity); 
    } [/code]

To read:
[code]
    function display_price($products_price, $products_tax, $quantity = 1) { 
      if ($products_price==0) {
        return '';
      } else {
        return $this->format(tep_add_tax($products_price, $products_tax) * $quantity); 
      }
    } [/code]

You will have to check if you need to change the function format in a similar manner.