MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

<script type="text/javascript">
	$('body').prepend('<a href="#" class="back-to-top">Back to Top</a>');
</script>

var amountScrolled = 300;

$(window).scroll(function() {
	if ( $(window).scrollTop() > amountScrolled ) {
		$('a.back-to-top').fadeIn('slow');
	} else {
		$('a.back-to-top').fadeOut('slow');
	}
});