Resources which are not secure

When I go to the checkout on my store, I'm getting a message saying that some items are not secure. I have no idea what those items could be. Can anyone give me any clues?

In IE 9, when I go to checkout it says “Only displaying secure content.” When I click on “Show all content” nothing visibly changes. So it must be something in my underlying code.

OK never mind. I figured it out. I had code in there for Comm100 chat and have removed it for now. If I can find out a way to have separate code on the SSL and non-SSL pages I'll re-install it.

There is an add-on you can download for Firefox that highlites in RED everything on your page that is insecure, I don't remember the name of it, but it is really handy.