jQuery: Change y background position

hankknight used Ask the Experts™
Using jQuery, I want to change the y background position without changing the x background position.

Neither these are valid working CSS:
background-position-y: -20px;
background-position: '' -20px;

How can I do this with jQuery?
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I already saw those links and they are useless.  They don't provide a solution.
what do you get when you do


you can extract xpos from it and then create new value with updated ypos.

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