function switchView(obj_id, state) {
					if(document.getElementById(obj_id) != null) {
						if(state == null) {
							var display = document.getElementById(obj_id).style.display;
							document.getElementById(obj_id).style.display = ((display == 'none') ? '' : 'none');
						} else {
							document.getElementById(obj_id).style.display=((state) ? '' : 'none');
						}
					}
				}