Drop-down box and buttons like in gmail

How to do this effects for <option> and 开发者_开发知识库<button> with CSS and JS?

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It's not real <select> or <button> element. The real form element would be (if it was a form element at the beginning) replaced with simple styled <ul> (one of the options). And javascript is used to hide select element, replace it with list and attach events to list items / anchors.

Edit: Gmail apparentyl doesn't use list, but divs. That's also an option.. logic behind it is still same.

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Try this. You have to change images and colors.