What is it called when JS is used to show only a certain part of a png?

Let's say you have a png and it contains all of the icons that are to be used on one page, what is the process of using JS to select and display on a certain icon in that image? I've always seen it being done, but it seems to evade me what it is, and how t开发者_开发百科o do it.

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It's done with CSS, not JavaScript, and it's called sprites.

http://css-tricks.com/css-sprites/

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You would use CSS and if you want it to be a really painless experience use this website below.

http://www.spritebox.net/

It will take care of generating the picture and also making generating the CSS you will need to output the icons.

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Sprites, but you would probably use CSS rather than Javascript.

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I guess you are referring to sprite image. js or css can be used to select images.