Element to which Class added dynamically has become unclickable

I have created a elevator functionality [there are 2 floors and corresponding to each one , there is a checkbox. Depending upon which checkbox is checked, the elevator shud move to that floor.

Couple of things which i'm not sure how to implement are:

1. wherever i have added class "unchecked" dynamically, the element looks as if it is not clickable. How do i make it clickable?

2. How to slow down speed of the Orange color elevator when it moves and stops at levels
   where checkbox is checked?

The fiddle is available at : http://jsfiddle.net/hurricaneankit/rJ4Py/12/ 

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