I have a slide show that creates the next slide dynamically and then
moves it into view. Since the images are actually sprites, the src is
transparent.png and the actual image is mapped via background:url(..
in css.

Everytime (well, most of the time) the script creates a new element,
Firefox makes an http request for transparent.png. I have a far-future
expires header, and Firefox is respecting all other files' expiries.

Is there a way to avoid these unnecessary requests. Even though the
server is returning 304 unmodified responses, it would be nice if
Firefox would respect the expiries on dynamically created images.

I suspect that if I injected a simple string instead of using new
Element, this might solve the problem, but I use some methods on the
Element object, so I would like to avoid a bunch of html strings in my
js file.

This is a nit-picky question, but I'm working on front-end
optimization now, so I thought I would address it.

Thanks.

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