Hide Background on moving Li to Top

Hide Background on moving Li to Top


Hi,
I need one help
On clicking on Li  i am taking that at top its working fine you can see here


In my application i have background white
But whats happening while moving that li  the background comes white as my app  has background white.
What i need is that when my li moves at top   it should adjust the backgroung in this way.





Note : But approach should be taken as the first link oi provided.



Thanks in Advance