MediaWiki:Common.js

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$(document).ready(function() {
    if ($('#custom-top-logo').length === 0) {
        var logo = $('<a>', {
            id: 'custom-top-logo',
            href: mw.util.getUrl('Main_Page'),
            css: {
                display: 'block',
                margin: '20px auto', // centrowanie
                width: '450px',
                height: '250px',
                background: 'url(/images/portallogo.png) no-repeat center',
                backgroundSize: 'contain',
                zIndex: 1000
            }
        });
        // wstawiamy logo **po headerze**, a nie w sidebarze
        $('#mw-header-container').after(logo);
    }
});