Web Store Checkout Process that Displays a Pop-Up Window Stating 'This page contains both secure and non-secure items'

Every time a user goes though the Web store's checkout process, they see a pop-up window appear stating This page contains both secure and non-secure items. 

NetSuite checkout process is a secure process. For that reason, notice the URL will change from http:// to https://. When you are on a secure server https:// and the page is calling a component that is not on a secure server, this pop-up will appear. For example, if a user declares an image file on that page as the following: <img src=http://domainname.com/images/image1.gif>, the security pop-up will appear.

 Declare the image file on the page as the following:
<img src=https://domainname.com/images/image1.gif> with a https and NOT http

Furthermore, view the source of the page where the pop-up appears and look for all components that has http:// in them and take necessary steps to change them to https://

Note: You may use browser plug-ins to view the loading of each element on the page. Examples are Http Watch, Firebug and the likes.

Tip: The easiest way to identify the elements/sources/links that ran/displayed insecure content on the site is by using Google Chrome. Load the page, right click on any area, click Inspect Element, and then go to the Console tab.