Actually you're going in the wrong direction and causing problems for yourself.
You don't need to have all links to your site as "https", and Zen Cart will work out for itself which pages should be SSL and which not.
The problem is that some of your content on https pages (which is now more than you need) comes from ordinary http sources, and that's what causes the warning.
An example (and possibly the only one) is your paypal logo. Currently you have it coded to come from
http://www.paypal.com/en_US/i/icon/v...ation_seal.gif.
Happily you can code that one to come from http
s://www.paypal.com/en_US/i/icon/verification_seal.gif.
But do stop coding all links to your site and internal links as https as that will only slow your site down and risk more of these problems for no benefit.
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