feature layer - Using toggle button with ArcGIS API for JavaScript?

I am trying to use two toggle buttons which have been added to a map to toggle layers on and off in my simple web application. I am having problems getting the toggle button to respond when clicked or checked.

This is what I have done so far. Added my button to the map and given it an id so I can grad it using dijit.byId

I then try listen for the onChange event with dojo.connect I put this in the init function that is called with dojo.addOnLoad(init);.

dojo.connect(dijit.byId('imagery'), 'onChange', layerVisibility(mapLayers[0]));

For some reason this does not run my function. I have tried replacing my function with an alert box to test it with no luck.

Here is an example of how I am using the code within a web application.

Where could I have gone wrong?