Fixing IE6 PNG transparency in Rails applications

I’m a fan of using IE6’s behaviors to fix PNG transparency (PNG Behavior, IE PNG Fix). Unfortunately the scripts that I’ve used do not work out of the box for Rails because of Rails appending a timestamp to the end of the PNG files. To fix this the behavior files need to be updated with a better regular expression for detecting these PNG file requests. It’s not difficult to do once you figure out that is what the problem is.