function show_detail () {
	var showdetail = document.getElementById ('showdetail');
	if (showdetail) {
		var display = showdetail.style.display;
		showdetail.style.display = 'block';
		var in_detail = document.getElementById ('in_detail');
		in_detail.style.display = 'none';
		return false;
	}
	else return true;
}