function toggle_on(obj) {			
			var el = document.getElementById(obj);
			el.style.display = '';	
		}

		function toggle_off(obj) {			
			var el = document.getElementById(obj);
			el.style.display = 'none';
		}
		

		
		function outside_toggle(obj) {			
			
			if (obj = 'outside_01') {
				toggle_on('outside_01');
				toggle_off('outside_02');
				toggle_off('outside_03');
			}
			
			else if (obj = 'outside_03') {
				toggle_off('outside_01');
				toggle_off('outside_02');
				toggle_on('outside_03');
			}
			
			else {
				toggle_off('outside_01');
				toggle_on('outside_02');
				toggle_off('outside_03');
			}						
			
			
		}