javascript - Div only fixed between two divs -


i want use following code (demo here). there way not have fixed div scroll between points set in pixels top, between 2 divs above , below fixed div?

$(window).scroll(function(){     $("#thefixed").css("top",math.max(0,250-$(this).scrolltop())); });

not sure understand question long modify 

math.max(0,250-$(this).scrolltop())

there should no specification. (20,250...) 20 px top.

and if want specify div can use $('thediv').offset()

like : 

var offset = $("#thefixed").offset() $(window).scroll(function(){     $("#thefixed").css("top",math.max(offset.top,250-$(this).scrolltop())); });

live exemple there


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