@media
only screen and (-webkit-min-device-pixel-ratio : 1.5),
only screen and (min-device-pixel-ratio : 1.5) {

.logo {background-image:url(../img/so-logo.png);}
.icon {background-image:url(../img/so-icon-sprite.png);}
#preloader {background-image:url(../img/preloader.gif);}
a#author {background-image:url(../img/pexcil.png);}
#nav #menu {background-image:url(../img/menu.png);}

}