function switchMenu(menuid, section) {
	var themenu = document.getElementById(menuid);
	if(themenu.style.display == "none") {
		themenu.style.display = "";
	} else {
		themenu.style.display = "none";
	}

	if(menuid != "submenu_aboutus" && section != 1) {
		document.getElementById("submenu_aboutus").style.display = "none";
	}
	if(menuid != "submenu_products" && section != 2) {
		document.getElementById("submenu_products").style.display = "none";
	}
	if(menuid != "submenu_wheretobuy" && section != 3) {
		document.getElementById("submenu_wheretobuy").style.display = "none";
	}
	if(menuid != "submenu_knowledge" && section != 5) {
		document.getElementById("submenu_knowledge").style.display = "none";
	}
	if(menuid != "submenu_service" && section != 6) {
		document.getElementById("submenu_service").style.display = "none";
	}
	if(menuid != "submenu_contact" && section != 7) {
		document.getElementById("submenu_contact").style.display = "none";
	}
}