MediaWiki:Common.js

/* Any JavaScript here will be loaded for all users on every page load. */
function ModifySidebar( action, section, name, link ) {
	try {
		var target = 'p-' + section;

		if ( action == 'add' ) {
			var node = document.getElementById( target ).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( '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 ) {
		// ignore
		return;
	}
}

function CustomizeModificationsOfSidebar() {
      ModifySidebar( 'add', 'toolbox', 'Import HTML', '/Special:Html2Wiki' );
}

jQuery( CustomizeModificationsOfSidebar );