var last_expanded = '';

function showHide(id) {
	var obj = document.getElementById(id);
	var status = obj.className;
	if (status == 'hide') {
		if (last_expanded != '') {
			var last_obj = document.getElementById(last_expanded);
			last_obj.className = 'hide';
		}
		obj.className = 'show';
		last_expanded = id;
	}
	else {
		obj.className = 'hide';
	}
}