a.txt_menu em {
    display:none;
}
a.txt_menu:hover {
    border: 0; 
    position: relative; 
    z-index: 500; 
    text-decoration:none;
}
a.txt_menu:hover em {
    font-style: normal; 
    display: block; 
    position: absolute; 
    top: -43px; 
    left: 30px; 
    padding: 5px; 
    color: #ffffff; 
	font-weight:bold;
	letter-spacing: 1px;
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 11px;
    border: 1px solid #ffffff; 
    background: transparent url(../img/fond_bulles.png); 
    width:250px;
}