This seems more complex than it needs to be based on what it's being used for. We could just do something like this:

```
var cssScaleTransform = function($el, scale) {
    var scaleTransform = 'scale(' + scale + ')';
    $el.css('-webkit-transform', scaleTransform)
         .css('-moz-transform', scaleTransform)
         .css('-ms-transform', scaleTransform)
         .css('transform', scaleTransform);
};
```