SSL page within an iframe

My webstore provider / credit card processor offers some great tools for customizing the look & feel of my shopping cart but...

I much prefer the effect I can achieve by displaying the secure shopping cart within an iframe on my own page. I understand that this is perfectly safe, but how do I convince my users? In IE, right-clicking within the iframe and selecting Properties does indicate that the frame is secure. Mozilla/Netscape, on the other hand, *seems* to indicate the opposite although I see it as a matter of semantics (Mozilla indicates the *page* is not secure but says nothing about the iframe within the page).

Suggestions?

I currently show an italicized "security note" at the bottom of the page, below the iframe, with differing instructions for viewing the frame info dependant on the currently detected browser. I could add a suggestion that the user simply load the frame contents in a new window/tab if they prefer.

Any other ideas?

You can't convince them.
We all know that the iframe part is still secure,
since it's not really your webpage, but they won't
know that.

I don't think there is any way around the "lock" icon
not appearing like it's supposed to. I'm guessing you'll
end up paying for SSL to secure a directory or section
of your website.

Of course, you could just open the secure page all by
itself, like it was intended. I know, it won't look like
your website, but it will add the comfort level your visitors
are looking for.

You can't convince them.
We all know that the iframe part is still secure,
since it's not really your webpage, but they won't
know that.

I don't think there is any way around the "lock" icon
not appearing like it's supposed to. I'm guessing you'll
end up paying for SSL to secure a directory or section
of your website.

Yeah, I decided to go ahead and pay for the certificate. My plan for the moment is to continue loading the secure cart within an iframe, but the page which holds the iframe will be my own and will itself be secure.

Of course, you could just open the secure page all by
itself, like it was intended. I know, it won't look like
your website, but it will add the comfort level your visitors
are looking for.

That's the way I had been doing it for the past three years and it was quite good (as I said, the webstore provider allows for a lot of serious customization), but it wasn't exactly what I wanted and I have been itching to do something about it. :)

Thanks for your thoughts. Have a happy holiday of your choice.