switch (screen.height) {
	case 600: var val = 1; break;
	case 720: var val = 1; break;
	case 768: var val = 600; break;
	case 800: var val = 600; break;
	case 864: var val = 600; break;
	case 900: var val = 700; break;
	case 924: var val = 700; break;
	case 960: var val = 700; break;
	case 1024: var val = 800; break;
	case 1050: var val = 800; break;
	case 1080: var val = 800; break;
	case 1200: var val = 1000; break;
	case 1440: var val = 1000; break;
	case 1536: var val = 1000; break;
	default : var val = 600; break;
}