@mixin clearfix {
	*zoom: 1;
	&:before, &:after {
		display:table;
		content:"";
	}
	&:after {
		clear: both;
		height: 0;
		visibility: hidden;
	}
}

@mixin at2x($path, $ext: "png", $w: auto, $h: auto) {
	background-image: url("../images/#{$path}.#{$ext}");
	background-repeat: no-repeat;
	background-size: $w $h;

	@media all and (-webkit-min-device-pixel-ratio : 1.5),
				 all and (-o-min-device-pixel-ratio: 3/2),
				 all and (min--moz-device-pixel-ratio: 1.5),
				 all and (min-device-pixel-ratio: 1.5) {
					 background-image: url("../images/#{$path}@2x.#{$ext}");
					 background-size: $w $h;
	}
}