Images from 2nd local site won't display in Firefox

I'm including images from one local website on another local website,
and they display fine with Internet Explorer but not with Firefox. I can
see the images' "outlines" in Firefox. In other words, a rectangle the
same size as each image appears. When I right-click on it and choose
"View Image," I get this message:

"Firefox doesn't know how to open this address, because the protocol (c)
isn't associated with any program."

I don't have a clue what it's talking about. Here are the paths to the
two images:

<img src="C:/sites/Geobop/images/GS/flags/world/na/usa/150/az.gif"

<img src="'.$BaseURL.'images/GS/flags/world/na/usa/150/az.gif"

(The second path translates the same as the first.")

I haven't disabled images; in fact, I can see other images on the page.
Can anyone tell me what's going on here?

Thanks.

--
www.geobop.org - Family Websites
www.invisible-republic.org - Adult political websites (Mature adults only)

P.S. I tried beginning the image's path with file:///C: and file:///c:,
but that doesn't work at all; it doesn't even display the image's shape.

--
www.geobop.org - Family Websites
www.invisible-republic.org - Adult political websites (Mature adults only)