function showdiv(idid) {
	if (document.getElementById(idid).style.visibility == "hidden") {
		document.getElementById(idid).style.visibility = "visible"
	} else {
		document.getElementById(idid).style.visibility = "hidden"
	}
}
function knopka (idid) {
	if (document.getElementById(idid).style.visibility == "hidden") {
		document.getElementById(idid).style.visibility = "visible"
	} else {
		document.getElementById(idid).style.visibility = "hidden"
	}
}