// function: show / hide menu
function showMenu(menuId) {
	document.getElementById(menuId).style.display="";
}

function hideMenu(menuId) {
	document.getElementById(menuId).style.display="none";
}

if (document.images) {
	serv1on = new Image;
	serv2on = new Image;
	serv3on = new Image;
	serv1off = new Image;
	serv2off = new Image;
	serv3off = new Image;

	nut1on = new Image;
	nut2on = new Image;
	nut3on = new Image;
	nut1off = new Image;
	nut2off = new Image;
	nut3off = new Image;
	
	serv1on.src = "i/stage/serv_sugg_on.jpg";
	serv1off.src = "i/stage/serv_sugg.jpg";
	serv2on.src = "i/stage/serv_sugg2_on.jpg";
	serv2off.src = "i/stage/serv_sugg2.jpg";
	serv3on.src = "i/stage/serv_sugg3_on.jpg";
	serv3off.src = "i/stage/serv_sugg3.jpg";
	
	nut1on.src = "i/stage/nut_info_on.jpg";
	nut1off.src = "i/stage/nut_info.jpg";
	nut2on.src = "i/stage/nut_info2_on.jpg";
	nut2off.src = "i/stage/nut_info2.jpg";
	nut3on.src = "i/stage/nut_info3_on.jpg";
	nut3off.src = "i/stage/nut_info3.jpg";
	
} else {

	serv1on.src = "";
	serv1off.src = "";
	serv2on.src = "";
	serv2off.src = "";
	serv3on.src = "";
	serv3off.src = "";
	
	nut1on.src = "";
	nut1off.src = "";
	nut2on.src = "";
	nut2off.src = "";
	nut3on.src = "";
	nut3off.src = "";

}