Refactoring JavaScript help

[Subliminal Aura]

OK I'm no JS coder but yay or nay to this || which version do you prefer ?....

Original code

function myupdatebart2(){
	if ($('.on_off :checkbox').prop('checked') == false) {
		socket.emit('updatebart2', false);
	} else {
		socket.emit('updatebart2', true);
	}
};
$('.on_off :checkbox').iphoneStyle({ onChange : myupdatebart2 });

Revision 2 - No point to this ? {works}

$('.on_off :checkbox').iphoneStyle({ onChange : function () { $('.on_off :checkbox').prop('checked') == false ? socket.emit('updatebart2', false) : socket.emit('updatebart2', true);} });

Revision 3 - Probably the best candidate {works}

$('.on_off :checkbox').iphoneStyle({ onChange : function () { socket.emit('updatebart2', $('.on_off :checkbox').prop('checked'));} });

Revision 4 - Makes obvious sense but the param needs a reference to a function and hence fails {fail}

$('.on_off :checkbox').iphoneStyle({ onChange : socket.emit('updatebart2', $('.on_off :checkbox').prop('checked')) });