function showTab(id1, id2, active_id, menu_id) {
	document.getElementById(id1).style.display = 'block';
	document.getElementById(id2).style.display = 'none';
	document.getElementById(id1 + '_footer').style.display = 'block';
	document.getElementById(id2 + '_footer').style.display = 'none';

	var menu = document.getElementById('menu_' + menu_id);
	var tabs = menu.getElementsByTagName('td');
	for (var i = 0; i < tabs.length; i++) {	
		if(i == active_id) {
			tabs[i].setAttribute('class', 'activetab');
			tabs[i].className = 'activetab';
		} else {
			tabs[i].setAttribute('class', 'inactivetab');
			tabs[i].className = 'inactivetab';
		}
	}
}