javascript - Positioning from fixed to static -

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i need have fixed div on screen between points, defined whether elements on top of screen or not.

i tried accomplish changing position via jquery. problem found is, @ bottom point, when change position fixed static, div jumps away, instead of start scrolling point on.

here jsbin: http://jsbin.com/woroyejahe/5/

thanks

just position of lower div , set top css style position: absolute.


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