function u1()
 	{
	document.getElementById("menu-prdoukte").style.visibility = "visible";
	document.getElementById("menu2").style.background = "#f29c2a";
	return true;
}
function u2()
 	{
	document.getElementById("menu-prdoukte").style.visibility = "hidden";
	document.getElementById("menu2").style.background = "none";
	return true;
}