MediaWiki:Foreground.js

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/* Scroll to top and sidebar logo */

var scrollbutton = document.getElementById("scrollToTop");
var sidebarlogo = document.getElementById("sidebarlogoimg");

window.onscroll = function() {scrollFunction()};

function scrollFunction() {
  if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
    scrollbutton.style.display = "block";
    sidebarlogo.style.display = "block";
  } else {
    scrollbutton.style.display = "none";
    sidebarlogo.style.display = "none";
  }
}

function topFunction() {
  document.body.scrollTop = 0; 
  document.documentElement.scrollTop = 0;
}