function showMenu(name) {
	for(var i =0; i < document.getElementsByName("downloads").length; i++) {
		document.getElementsByName("downloads")[i].style.visibility="hidden";
	}

	if (document.getElementById(name)) {
		document.getElementById(name).style.visibility="visible";
	}
	if(name == "company" || name == "contacts" || name == "products" || name == "download" || name == "hideAll") {
		if(name != "company") {hideMenu("company");}
		if(name != "contacts") {hideMenu("contacts");}
		if(name != "products") {
			hideMenu("products");
			hideMenu("assembly_1");
			hideMenu("assembly_2");
			hideMenu("assembly_3");
			hideMenu("assembly_4");
		}
		if (name.substring(0,8) != "assembly") {
			hideMenu("assembly_1");
			hideMenu("assembly_2");
			hideMenu("assembly_3");
			hideMenu("assembly_4");
		}
		if(name != "download") {hideMenu("download");}
	}
	if (name.substring(0,8) == "assembly") {
		name = name.substring(9,10);
		if(name >0 && name < 5) {
			for (i =1; i< 5; i++) {
				if (name != i) {
					hideMenu("assembly_" + i);
				}
			}
		}
	}

}
function hideMenu(name) {
	if((name != "products") && (document.getElementById(name))) {
		document.getElementById(name).style.visibility="hidden";
	}
	else {
		if (
			document.getElementById("assembly_1").style.visibility == "hidden" &&
			document.getElementById("assembly_2").style.visibility == "hidden" &&
			document.getElementById("assembly_3").style.visibility == "hidden" &&
			document.getElementById("assembly_4").style.visibility == "hidden"  
		) {
			if(document.getElementById(name)) document.getElementById(name).style.visibility="hidden";
		}
	}

}

function hideAllMenu() {
	showMenu("hideAll");
}