function navi_open(level, childs){
	var id, e, s;
	id = "navi_"+level;
	e = document.getElementById(id);
	s = e.style;
	s.backgroundImage = "url(layout/navi_selected.gif)";
	s.color = "#FFA800";

	for(i=1;i<=childs;i++){
		document.getElementById(id+"_"+i).style.display = "block";
	}
}

function navi_close(level, childs){
	var id, e, s;
	id = "navi_"+level;
	e = document.getElementById(id);
	s = e.style;
	s.backgroundImage = "url(layout/navi.gif)";
	s.color = "#FFFFFF";

	for(i=1;i<=childs;i++){
		document.getElementById(id+"_"+i).style.display = "none";
	}
}