function menu_over(polozka, over)
{
	if (over == true)
		polozka.style.visibility = "visible";
	else
		polozka.style.visibility = "hidden";
}

function td_over(polozka, over)
{
	if (over == true)
		polozka.style.background = "#EBFBFF";
	else
		polozka.style.background = "#B3D9FF";
}