This page contains both secure and nonsecure items.  Do you want to display the nonsecure items?

Since some PDshop store sections (such as Top, Bottom, Area 1 & 2, and some UD sections) are displayed over both non-secure and secure URLs, you should not reference your non-secure URL when inserting images or graphical elements.  

If you receive the above message repeatedly when proceeding to "checkout", this usually indicates that one of your storefront sections is referencing a non-secure URL (forcing the users browser to load a non-secure image on a secure page).  

To fix this error, you need to check how you linked to outside images or code.  Be sure to use secure (https) URLs in your code.  

Or, if you are inserting images that are on your server, make sure you did not link to them using the full URL. When you insert images or any elements hosted on your own server, you should use links like this:
"../images/file.jpg"
not
"http://mysite.com/images/file.jpg"

PDshop was designed to handle switching between a non-secure page and a secure page (SSL).  When inserting images while using the content/HTML editor in PDAdmin, use the Insert Image Icon.  When you insert images this way the URL is not saved, only a reference to the folder.  Then, when the page is displayed later on, PDshop will plug in the correct URL prefix.