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var offset = 100;
var speed = 250;
var duration = 500;
if ($(this).scrollTop() < offset) {
$('.topbutton') .fadeOut(duration);
} else {
$('.topbutton') .fadeIn(duration);
$('.topbutton').on('click', function(){
$('html, body').animate({scrollTop:0}, speed);
return false;
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