1. Create a radio button group. This will allow only one checked at a time.2. You'll need a function, which in one way or another hides the visible layer and shows the one that was selected.Perhaps something like:func: function(layer) {
map._layers.class.hide();
map._layers.order.hide();
map._layers.family.hide();
eval('map._layers.' + layer + '.show()');
}
calling it like so:func('class');
Changing the "layer" for each input respectively.That's just one of many ways in which you can achieve the result. I noticed in your example you didn't give your layers an id. I never let the api assign an id to a layer. If you add an id, it's easy to go to the _layers object to impress change upon a layer. All map layers can be found here.