CSS Sprite图片处理技巧

Each vertical value is equal; since the master image is 400 pixels high and the after states sit in the bottom half, we’ve simply divided the height. Shifting the whole background image up by 200px requires us to apply the value as a negative number. Think of the top edge of the link as the starting point, or 0. To position the background image 200 pixels above this point, it makes sense to move the starting point -200px.

Likewise, if the left edge of each link is effectively 0, we’ll need to offset the background image horizontally by the width of all <li>s prior to the one we’re working with. So the first link doesn’t require an offset, since there are no pixels before its horizontal starting point. The second link requires an offset the width of the first, the third link requires an offset of the combined width of the first two links, and the last requires an offset of the combined width of all three previous links.

It’s a bit cumbersome to explain the process, but playing around with the values will quickly show you how the offsets work, and once you’re familiar it’s not all that hard to do.

So there you have it. Single-image CSS rollovers, degradable to a simple unordered list.

Buttons

There’s no reason why we have to leave the links touching each other, side-by-side as they were in the previous example. Image maps may be convenient in some spots, but what about separating each link into its own stand-alone button? That way we can add borders and margins, let the underlying background show through, and generally treat them as separately as we need to.

In fact, the building blocks are already in place. We really don’t need to modify our code too radically; the main change is in creating a new background image that doesn’t continue from link to link like the last example did. Since we can’t rely on the <ul> for placing th

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