Image Gallery Slide Last Element

I am currently stuck up on something.. check this page [URL] Well for starters.. I am trying to mimic this effect.. [URL] The slider on the very top.. A quick preview of what I did was.. I used this plugin.. easyslider().. And then edited it.. since I am still learning jQuery and javascript.. so I made changes to the controls... usually the elements for design.. all I did was that.. The first problem was how to make it center like the one on the vogue.. so it was done...

Second the masking problem.. I had alot of trouble thinking how I am going to do this.. because whenever I used absolute position on masks and the controls, everything is messed up on all browser.. So my problem primarily was how to make the effect like vogue mask, so what I did was used opacity on the list... and add a class active that regains the opacity 1 on the middle part of the slider.. so that was done..

My follow up problem is whenever I am navigating through the slider.. I add the "active" class on the next item on the list.. up until there I am fine.. but when I am at almost at the end, at the 5th slider, I am not getting the active class? and after a couple of clicks on the "next".. it wont navigate through...

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