function grayOut(vis) {
	if (vis) {
		document.getElementsByTagName("html")[0].style.overflow = "hidden";
		ShowLoginScreen();
		jQuery("#darkBody").show();
		jQuery("#DuokJointaDebile").show();
		setFocus();
	} else {
		jQuery("#darkBody").hide();
		jQuery("#DuokJointaDebile").hide();
		document.getElementsByTagName("html")[0].style.overflow = "auto";
	}
}