javascript - Animating an arrow that points to <li> based on position on the screen -

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i not familiar html, css , javascript

i using twitter bootstrap, i'd have section indicator in long page shows relative position of current view relative entire ver long scrollable page.

the sample of want achieve in: http://global.tommy.com/int/en/collections/start

i managed <ul> <li>, however, i'd animate arrow movement 1 <li> next <li> user scroll , down within page. managed scope out code <ul> <li> have no idea how animate movement... me point specific animation part or recommend javascript or css library that? missed twitter-bootstrap elements too, did not find far... thanks!

edit:

my code in jsfiddler, however, doesn't seem work in jsfiddler:

the ul li code

what wanted achieve animation on left side of tommy hilfiger's page when scroll , down, arrow keep track of section in adjusting arrow's position pointing specific section on li

without more detail can't go specifics, can @ least suggest jquery's animate function. makes animating css properties easy.


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