Produces a sliding button like those on iPhones
Description
Mostly a visual trick, produces a sliding button like those on iPhones.
Marc has made a much better version:
http://yuilibrary.com/gallery/show/slidecheckbox
```
YUI().use('gallery-md-ibutton', function(Y) {
"use strict";
var iButton = new Y.IButton({
labelOn:'yes',
labelOff: 'no'
}).render('#test');
iButton.on('valueChange', function (ev) {
Y.log(ev.newVal,'info','iButton');
});
});
```