[jQuery] Trying to add/remove a class "when...."

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Hey all.

I'm trying to add/remove a class and am having trouble. When I add the
new class, the color takes hold, but not the changing of the
background image.

The original CSS is defined as input[type="button"]{background-
image:....}

How do I remove a class that is defined like the one above? I tried
removeClass("input"), but that didn't work.