// ロールオーバー  obj->name, change_obj->path
function change_img(obj,change_obj) {
	document.images[obj].src = change_obj;
}

//プルダウンメニュー id->プルダウンさせる<div>のid
flag = false;

function pulldown(id){
	if (flag) {
		document.getElementById(id).style.visibility = "hidden";	
	} else {
		document.getElementById(id).style.visibility = "visible";	
	}
	flag = !flag;
}

function keep_pulldown(id){
	document.getElementById(id).style.visibility = "visible";
	flag = true;
}

function delete_pulldown(id){
	document.getElementById(id).style.visibility = "hidden";
	flag = false;
}