Compare .hidden() and .visible()
Reloading/Refresh Page with jQuery
if visible :change
 
Refresh
 
if visible:fadeOut
 
if hidden:show(slow)
 
Div1 : not()
Art
CIS
CIS100
CIS200
Chemistry
Ch100
Ch200
Debate
Div2 :has
Art
CIS
CIS101
CIS102
Chemistry
Ch101
Ch201
Debate