MediaWiki:Vector.js

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/* Any JavaScript here will be loaded for users using the Vector skin */

// Cache selectors outside callback for performance. 
var $window = $(window),
   $stickyEl = $('#p-googleadsense'),
   elTop = $stickyEl.offset().top;

$window.scroll(function() {
	$stickyEl.toggleClass('sticky', $window.scrollTop() > elTop);
});