$(document).ready(function(){
   function hidePopup(el) {
      el.hide();
      el.parent().prev().hide();
   }

   $('.link-block').mouseover(function(){
      var el = $(this).parent().next('.link-popup'),
          timer = el.attr('timer');
      if (timer != '0')
         clearTimeout(timer);
      el.attr('timer', 0);
      $(this).parent().addClass('selected');
      el.show();
   }).mouseleave(function(){
      var el = $(this).parent().next('.link-popup');
      el.attr('timer', setTimeout(function(){hidePopup(el)}, 100));
   });
   $('.link-popup').mouseover(function(){
      var timer = $(this).attr('timer');
      if (timer != '0')
         clearTimeout(timer);
      $(this).attr('timer', 0);
   }).mouseleave(function(){
      var el = $(this);
      el.attr('timer', setTimeout(function(){hidePopup(el)}, 100));
   });
});