       </BS.NavItem>
       <BS.DropdownButton title="Available Books" className="dropdown-toggle">
         {for book in EcosystemsStore.allBooks()
-          <li key={book.id}><BookLink book={book} /></li>}
+          <li key={book.id} className={'active' if @props.ecosystemId is book.ecosystemId}>
+            <BookLink book={book} />
+          </li>}
       </BS.DropdownButton>
     </BS.Nav>
 

  propTypes:
    bookId: React.PropTypes.string.isRequired
    section: React.PropTypes.string

  getInitialState: ->
    isShowingTeacherContent: true, isShowingBook: false

    if @state.isShowingBook
      teacherContent = <TeacherContentToggle isShowing={@state.isShowingTeacherContent}
        onChange={@setTeacherContent} />
    <BS.Nav navbar right>
      <BS.NavItem>
        {teacherContent}
