ModifySidebar.js

function ModifySidebar( action, section, name, link ) { try { switch ( section ) { case 'languages': var target = 'p-lang'; break; case 'toolbox': var target = 'p-tb'; break; case 'navigation': var target = 'p-navigation'; break; default: var target = 'p-' + section; break; }

if ( action == 'add' ) { var node = document.getElementById( target ) .getElementsByTagName( 'div' )[0] .getElementsByTagName( 'ul' )[0];

var aNode = document.createElement( 'a' ); var liNode = document.createElement( 'li' );

aNode.appendChild( document.createTextNode( name ) ); aNode.setAttribute( 'href', link ); liNode.appendChild( aNode ); liNode.className = 'plainlinks'; node.appendChild( liNode ); }

if ( action == 'remove' ) { var list = document.getElementById( target ) .getElementsByTagName( 'div' )[0] .getElementsByTagName( 'ul' )[0];

var listelements = list.getElementsByTagName( 'li' );

for ( var i = 0; i < listelements.length; i++ ) { if ( listelements[i].getElementsByTagName( 'a' )[0].innerHTML == name || listelements[i].getElementsByTagName( 'a' )[0].href == link ) { list.removeChild( listelements[i] ); } } }

} catch( e ) { // let's just ignore what's happened return; } }

function CustomizeModificationsOfSidebar() { // adds Special:CategoryTree to toolbox ModifySidebar( 'add', 'toolbox', 'CategoryTree', 'https://en.wikipedia.org/wiki/Special:CategoryTree' ); // removes Special:Upload from toolbox ModifySidebar( 'remove', 'toolbox', 'Upload file', 'https://en.wikipedia.org/wiki/Special:Upload' ); }

jQuery( CustomizeModificationsOfSidebar );