function toggle_menu(elem, type){
	if(type == "on"){
		document.getElementById("menu_"+elem).style.display = "none";
		document.getElementById("menu_"+elem+"_on").style.display = "";
	
	} else if(type == "off"){
		document.getElementById("menu_"+elem).style.display = "";
		document.getElementById("menu_"+elem+"_on").style.display = "none";
	}
}