Prova questa
$(document).ready(function(){
$(window).scroll(function(){
if ($(window).scrollTop() > 200 ||$(window).scrollTop() < 210){
$( "#outer:nth-child(2) #center img:nth-child(1)" ).stop().animate({
opacity: 0.25,
left: "+=50",
}, 2000, function() {
});
}
});
});