IE6 + AlphaImageLoader + hover

the 'filter' nomenclature is unwieldy, so these lines are going to be long, you'll need to scroll. The gist is - ORDER MATTERS! - and the order is opposite from what you'd expect.

/* order matters! */
.carousel a:hover .playbutton{background:transparent url(/css/i/x.gif);filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src="/css/i/icons/playbutton_thumb_hover.png", sizingMethod="crop");}
.carousel .playbutton{background:transparent url(/css/i/x.gif);filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src="/css/i/icons/playbutton_thumb_normal.png", sizingMethod="crop");}
a:hover .playbutton{background:transparent url(/css/i/x.gif);filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src="/css/i/icons/playbutton_hover.png", sizingMethod="crop");}
.playbutton{background:transparent url(/css/i/x.gif);filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src="/css/i/icons/playbutton_normal.png", sizingMethod="crop");}