a.oubl {
   position: relative;
   color: white;
   text-decoration: none;
   border-bottom: 1px gray dotted; /* On souligne le texte. */
}
a.oubl span { display: none; }
a.oubl:hover {
   background: none;/*IE*/ z-index: 5000; 
   cursor: pointer;
}
a.oubl:hover span {
   display: inline; position: absolute;
   white-space: nowrap; 
   top: -58px !important; top:36px; left: 0px; background: black; color: white; padding: 1px; border: 0px solid green; border-left: 0px solid green;
}