var list = document.getElementById('list');var prev = document.getElementById('prev');var next = document.getElementById('next');function animate (offset) { var newLeft = parseInt(list.style.left) + offset; list.style.left = newLeft+'px'; if(newLeft>-1000){ list.style.left=–3000+'px'; } if(newLeft<-3000){ list.style.left=–1000+'px'; } } next.onclick = function () { animate(-1000); } prev.onclick = function () { animate(1000); }
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