$(function() { var $topbar = $(".elgg-page-topbar"), $window = $(window); $topbar.css({position: 'fixed', width: '100%'}); $window.scroll(function() { $topbar.stop(); var opacity; if ($window.scrollTop() > 14) { $topbar.animate({opacity: 0}, 'fast'); } else { $topbar.css({opacity: 1}); } }); $topbar.mouseenter(function(){ $topbar.stop(); $topbar.animate({opacity: 1}); }) .mouseleave(function(){ $topbar.stop(); var opacity; if ($window.scrollTop() > 14) { opacity = 0; } else { opacity = 1; } $topbar.animate({opacity: opacity}); }); });