switch (window.screen.colorDepth) {
        case 1:
        case 4:
          document.bgColor = "white";
          break;
        case 8:
        case 15:
        case 16:
          document.bgColor = "blue";
          break;
        case 24:
        case 32:
          document.bgColor = "skyblue";
          var y = window.screen.height;
          var x = window.screen.width;
          break;
        default :
          document.bgColor = "gray";
      }

      document.write("Su pantalla soporta color de " + window.screen.colorDepth + " bit " + " 
 Con Height : " + y + " Width : " + x);