Use different method of image replacement.
Use different method of image replacement.

We were using the one found here:
http://nicolasgallagher.com/another-css-image-replacement-technique/.
But as that URL says, there are some known issues and mentions a
different technique, found here:
http://nicolasgallagher.com/css-image-replacement-with-pseudo-elements/.

The only drawback to this method is no support for Internet Explorer
versions prior to 8, which we don't care about.

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