Example
show modal
Markup
   <a href="javascript:void(0)" class="js-open">show modal</a>
   <div class="modal" style="display:none;">
      <div class="modal-inner">
         <div class="sprite sprite_close_gray layout_abs layout_abs_topRightInside js-close"></div>
         <div class="js-modalBody">modal info goes here</div>
      </div>
   </div>
   <script type="text/javascript">
      //see also modal.bsfy
      deferred.push(function(){
         $('.js-close').click(function(){$('.modal').hide()});
         $('.js-open').click(function(){$('.modal').show()});
      });
   </script>
Source: modules/07_large_elements/modal.less, line 7