preloading jquery ui icons - is there a trick?

What's the best way to g开发者_StackOverflowet the jquery ui icons to preload for rollover/hover etc...?

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This should do the trick:

    var img = new Image();
    img.src = '/themes/yourTheme/images/ui-icons_whatever.png';

Note that this is done asynchronously, so the rest of the page may load before the image(s) finish loading- but at least they will (probably) load before the user triggers a hover or other event.