#billboard .hero.ios8 .hero-image { background-image:url(http://images.apple.com/cn/home/images/ios8_hero_small.jpg); }
#billboard .hero.yosemite .hero-image { background-image:url(http://images.apple.com/cn/home/images/yosemite_hero_small.jpg); }

/* large desktop & ipad portrait */
@media only screen and (min-height:1250px),
		only screen and (min-device-width:481px) and (max-device-width:768px) and (orientation:portrait) {
	#billboard .hero.ios8 .hero-image { background-image:url(http://images.apple.com/cn/home/images/ios8_hero.jpg); }
	#billboard .hero.yosemite .hero-image { background-image:url(http://images.apple.com/cn/home/images/yosemite_hero.jpg); }
}

/* between large and medium desktop */
@media only screen and (max-height:1249px) and (min-height:1064px) {
	#billboard .hero.yosemite .hero-image { background-image:url(http://images.apple.com/cn/home/images/yosemite_hero_medium.jpg); }
}

/* medium desktop */
@media only screen and (max-height:1063px) {
	#billboard .hero.yosemite .hero-image { background-image:url(http://images.apple.com/cn/home/images/yosemite_hero_small.jpg); }
}

/* ipad portrait */
@media only screen and (min-device-width:481px) and (max-device-width:768px) and (orientation:portrait) {
	#billboard .hero.yosemite .hero-image { background-image:url(http://images.apple.com/cn/home/images/yosemite_hero_medium.jpg); }
	#billboard .hero.ios8 .hero-image { background-image:url(http://images.apple.com/cn/home/images/ios8_hero_small.jpg); }
}