there are ways to get around the .PNG transparency issues in IE 6 and most major browsers.
As far as the latest browsers go, most do support PNG-24 now with no problem, as for older browsers, there is work arounds and also javascript codes that will get rid of the problem.
It really all comes down to how many version of each browser you would like to support. Changing or recreating the files and saving them as PNG should not take that long if you want to do it yourself.
As far as the file size concern goes, if the background images mentioned are repeating, then there is no need for the image to exceed a 1px height or width (depending if it is vertical / horizontal pattern), and because of that it shouldn't really be much more than a .GIF file the same size.
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