Just testing something I remember from other forums to see if it works here. If you want to give a "spoiler" answer to something, you could write the answer in a white font, and then anyone who wanted to know the answer could see it by highlighting it. The answer to the ultimate question of life, the universe, and everything, according to the late Douglas Adams: forty-two. Okay, it looks like you have to use a sort of beige for this skin, and I haven't quite got the right shade, anyway. White would work for the default skin, but I'd guess that most people prefer the vintage, as I do.
Nifty Button. What's it do? (Move your mouse to reveal the content) Nifty Button. What's it do? (open) Nifty Button. What's it do? (close) Look under the Help tab for BB Codes, such as spoiler. There really is no "right shade" with the vintage skin, to do this the way you're trying. I learned that lesson.
Like this? (Move your mouse to reveal the content) Like this? (open) Like this? (close) So let's try this. Thanks!
Can the spoiler code hide an image too? (Move your mouse to reveal the content) hide an image too? (open) hide an image too? (close) Why shouldn't it?