$(document).ready(function() {
  $(".popup").hide();
  
  $(".label-libelle").mouseover(function() {
	  var popup =  $(this).next("div.popup");
	  
	  popup.css({"margin-left":"40px", "margin-top": "10px"}).fadeIn("slow");
  }).mouseout(function (){
	  var popup =  $(this).next("div.popup");
	  popup.fadeOut("slow");
  	});
});