Responsive Slider

As you can see in this example - http://globalcreative.co.uk/clientarea/tts/ - the slider does not stay in a central position when the browser window is expanded beyond 1280px wide.

We need this remedied and so it still operates the same (able to see slide left and right of central slide on larger resolutions).

This is a great example here - http://www.creative-jar.com (although copyrighted) of how we wanted it to work?

It needs to be responsive as the site has now been built to be responsive.