function show_desc(element) {
  idstr = '#' + element.id + '-desc';
  $(idstr).fadeIn(1000);
}

$(document).ready(function(){

   $(".tag").click(function(event){
     $("#desc-container").fadeIn(500);
     $("#desc-container").fadeTo(500, 0.93, show_desc(this));
     event.preventDefault();
   });

   $(".description").click(function(event){
     $("#desc-container").fadeOut(500);
     $(this).fadeOut(500);
     event.preventDefault();
   });

});