javascript - jquery delay/animate start bugging after some time and overlapping -

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i got work on piece of jquery code runs simple slider of 3 images, shows , hides them 1 one, , should repeat process indefinitely.

here code:

$(document).ready(function () {     function start_slider() {          $('#slider_img_1').animate({             top: '-=495'         }, 1000).delay(4000).animate({             top: '+=495'         }, 1000);         $('#slider_img_2').delay(6000).animate({             top: '-=495'         }, 1000).delay(4000).animate({             top: '+=495'         }, 1000);         $('#slider_img_3').delay(12000).animate({             top: '-=495'         }, 1000).delay(4000).animate({             top: '+=495'         }, 1000);         settimeout(function () {             start_slider();         }, 18000);     }     start_slider(); });

now far understand this, animates first picture 1s, holds 4s , animates 1s. same other 2. math fits in? last 18s in total , starts again.

problem: it works maybe 3-5min, see 2 images overlap once. after 10min start overlapping more , increases on time.

what problem? (note: same bug in firefox , chrome)


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