function goster(elmnt) {
	var durum = document.getElementById(elmnt).style.display;
	if (durum == "none") {
		document.getElementById(elmnt).style.display = "block";
	} else {
		document.getElementById(elmnt).style.display = "none";
	}
}

function showmenu(elmnt){
	document.getElementById(elmnt).style.visibility="visible"
}
function hidemenu(elmnt){
	document.getElementById(elmnt).style.visibility="hidden"
}