Continuous Horizontal Variable Width Image Files Ticker?

My client wants a ticker, only with client logos. I've found several scripts which are cool, though no one is precisely what I'm after. Company logos vary in their proportions. I'd like ideally a script able to continuously horizontally animate images of the same height, but with variable widths. Found plenty of scripts moving same width images left/right, or using a carrier (table/div/layer) to contain a set of variable width images - the latter leads to blank moments my client doesn't like while the carrier is repositioned.

I'm very intrigued as to why this doesn't seem to have been done and wonder if there's a reason. Is the computation needed in passing widths in a variable to a move function too much for the client-side? I don't want to waste my time wading into repurposing a script for this if it's not viable as I can't pass that cost on to the client, you see. I'd rather bail and do it using Flash.