[jQuery] question on using toggle() properly

[eben]

I am fairly new to jquery and still trying to get my head around some
proper implementation.  I'm hoping someone can explain why this works:

function doToggle(id){
id = '#'+id;
$(id).toggle();
}

but, this does not:

function doToggle(id){
id = '#'+id;
$(id).toggle(
function(){alert('something');},
function(){alert('something else')}
);
}

This gets called from: <a href="javascript: void(0);"
onclick="javascript: doToggle('some_div_to_toggle');">link</a>

Any advice is appreciated.