Considering you're using a template from Template Monster, I wouldn't risk changing anything as their template have a reputation for being more hacks than actual templates. If you do a search on both osCommerce's and ZenCart's forums you'll find plenty of examples of people who've had loads of problems with their "templates". If it's working as it is, I'd leave it for now and wait until v3 is released then decide if you want to upgrade to that.

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Lawrence