// JavaScript Document
function show(text){
	var menu_id = "menu_" + text;
	var btn_id = "btn_top_" + text;
	document.getElementById(btn_id).style.visibility = "visible";
	document.getElementById(menu_id).style.backgroundPosition ="bottom left";
}

function hide(text){
	var menu_id = "menu_" + text;
	var btn_id = "btn_top_" + text;
	document.getElementById(btn_id).style.visibility = "hidden";
	document.getElementById(menu_id).style.backgroundPosition ="top left";
}