https://benimodo.es/wp-content/plugins/simple-back-to-top//js/sbtt.js?ver=88a4b8a1d8efe377d699ca9c94dabd95

1// Simple Back To Top Scripts
2jQuery(document).ready(function() 
3{
4    jQuery("body").append('<div id="sbttBacktotop" class="sbttBacktotop"><img src="'+sbttback.sbttimg+'" alt"sbtt"></div>'); 
5	jQuery(window).scroll(function()
6	{
7		if(jQuery(this).scrollTop()!=0)
8		{
9			jQuery("#sbttBacktotop").fadeIn()
10		}
11		else
12		{
13			jQuery("#sbttBacktotop").fadeOut()
14			
15		}
16	});
17	jQuery("#sbttBacktotop").on('click touchstart',function(e)
18	{
19		e.preventDefault();
20		jQuery("body,html").animate({scrollTop:0},500);
21		 return false; 
22	});
23});