function expand(id){
	menu_sub = new Array();
	for (ii = 1; ii <= total_sub_num; ii++) {
		document.getElementById('menu_sub'+ii+'_1').style.display = "none";
		document.getElementById('menu_sub'+ii+'_2').style.display = "";
	}

	document.getElementById('menu_sub'+id+'_1').style.display = "";
	document.getElementById('menu_sub'+id+'_2').style.display = "none";
return true;
}

function close_expand(){
	menu_sub = new Array();
	for (ii = 1; ii <= total_sub_num; ii++) {
		document.getElementById('menu_sub'+ii+'_1').style.display = "none";
		document.getElementById('menu_sub'+ii+'_2').style.display = "";
	}
return true;
}