I'm trying to make a custom jQuery toggle function. Right now, I have 2 separate functions, `lightsOn` and `lightsOff`. How can I combine these functions to make them toggle (so I can just link to one function)?

```
function lightsOn(){
 $('#dim').fadeOut(500,function() {
   $("#dim").remove();
 });
};

function lightsOff(){
 $('body').append('<div id="dim"></div>');
 $('#dim').fadeIn(250);
};

```