how to add active class on centre li

I would like to Make one “coverflow effect” based on DIV. I decided to use bxslider and everything is working fine but I am not getting the centre "zoom effect" which I would like... You can see an example of what I want here.http://ift.tt/1z0gWuV

I'm not sure how to get this effect on the bxslider. Would it be possible if I add extra class on each center LI ? Meaning, whichever "li" is moving to the center, I can add one class "active"... so I can make active transform:sceal etc.

Do you have any ideas on how I can make this happen? Or any other coverflow script you can recommend for this....

Thanks.

Demo

http://ift.tt/1brrzvY