function popup(url, high, wide)
{
    feature = 'width='+high+',height='+wide+',toolbar=no,menubar=no,status=no,scrollbars=yes,resizable=no';
    window.open(url, 'window', feature);
}
function show_search()
{
if (document.getElementById("menu_busca").style.visibility == "visible")
{
document.getElementById("menu_busca").style.visibility = "hidden";
} else {
document.getElementById("menu_busca").style.visibility = "visible";
}

}