anchor.diff:                <input id='random_assign'
                   className='image_input'
                   src='<%= image_path 'random_arrow.png' %>'
  +                title='<%= j raw I18n.t('groups.randomly_assign_graders') %>'
                   alt='<%= j raw I18n.t('groups.randomly_assign_graders') %>'
                   onClick={this.performAction}
                   type='image'
  
positive.code:               <input id='unassign'
                  className='image_input'
                  src='<%= image_path 'remove_arrow.png' %>'
                  alt='<%= j raw I18n.t('remove_graders') %>'
                  onClick={this.performAction}
                  type='image'
  
negative.code:               <input id='assign'
                  className='image_input'
                  src='<%= image_path 'add_arrow.png' %>'
                  title='<%= j raw I18n.t('add_graders') %>'
                  alt='<%= j raw I18n.t('add_graders') %>'
                  onClick={this.performAction}
                  type='image'
  