A while ago at work my colleague Alex discovered something in CSS that none of us knew.
When assigning a class to a div like so:
<div class="blah">...</div>
You can choose more than one class:
<div class="blah anotherclass andanotherclass">...</div>
This is incredibly helpful at times. I even used it in the re-design of the site here. The rollover images down at the bottom use this technique. There is a generic class that does the rollover background image changes and then more specific classes so that the image to use can be specified. Neato stuff.
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