function nova_janela(mypage, myname, w, h, scroll) {
	if($("#lang").val() != null)
		mypage = mypage + "&lang=" + $("#lang").val();
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2;
	winprops = "height=" + h + ",width=" + w + ",top=" + wint + ",left=" + winl + ",scrollbars=" + scroll + ",toolbar=no,location=no,directories=no,status=no,resizable=yes";
	win = window.open(mypage, myname, winprops);
	if(parseInt(navigator.appVersion) >= 4)
		win.window.focus();
}