var v_mnus = Array("","home","quem","areas","tabela","contato");

var isDOM = (document.getElementById ? true : false);
var isIE4 = ((document.all && !isDOM) ? true : false);
var isNS4 = (document.layers ? true : false);

function getRef(id) 
{
	if (isDOM) return document.getElementById(id);
	if (isIE4) return document.all[id];
	if (isNS4) return document.layers[id];
}

function getSty(id) 
{
	return (isNS4 ? getRef(id) : getRef(id).style);
}

function muda_pg(x)
{
	getRef("mnu" + v_ativa).src = "images/mnu_" + v_mnus[v_ativa] + "1.jpg";
	getRef("mnu" + x).src = "images/mnu_" + v_mnus[x] + ".jpg";
	v_ativa = x;
	window.frm_naveg.location = " pg_"  + v_mnus[v_ativa] + ".html";
}