what i meant was you should do this

```css
.customer1 { background-image: url(/images/customer1.jpg); }
.customer2 { background-image: url(/images/customer2.jpg); }
```

and then in the js 

```javascript
$videoTestimonial.find('.background-image:hidden').removeClass('customer2');.addClass('customer1');
```

your javascript should just be flipping classes on and off, the css should contain what the actual elements look like and other display info.