Displaying a different currency on your website, than what's in the Standards & formats setting

Shopify Partner
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Hi, I have a client that has a business in South Africa but wants to have their site display USD. The payment gateway requires ZAR the currency sent to them, so that's what I'm using in the Standards & formats. I have already set up the site to be able to toggle between the two currencies, as outlined in other documentation (http://docs.shopify.com/support/configuration/store-customization/how-to-toggle-between-two-currenci...). But now, if I can just get the site to display USD by default, perhaps via the jquery.currenciesmin.js, that should solve my problem. I appreciate the assistance!