As I've been looking at Mineimator, I can't help but notice all of the characters with transparent backgrounds pasted all over the sites (Like in this site's header). I want to do something similar with my website, taking my skin and using it in the headers, etc. but I have absolutely no clue how to get rid of the white/black/colored backgrounds behind the characters. (I also need to be able to export full animations with transparent backgrounds).
Thanks for any help!