codigo:
<a href="http://www.phpost.net/index.php?showtopic=25915" id="float_msg" target="_blank" onclick="$(this).remove()"><strong>¡Concurso Navideño!</strong>Quedan NaN minutos de valoraciones
</a>

CSS:
a#float_msg {
position: fixed;
bottom: 51px;
line-height: 16px;
text-align: left;
right: 10px;
z-index: 30000;
opacity: 0.8;
width: auto;
height: auto;
background: #cf3737;
color: #fff;
text-shadow: rgba(0,0,0,0.3) 0px -1px 0px;
padding: 10px;
text-decoration: none;
font-size: 11px;
font-family: Tahoma;
border: 1px solid #771b1b;
box-shadow: rgba(0,0,0,0.3) 0px 1px 4px, inset #f66c6c 0px 1px 0px;
border-radius: 3px;
}

#float_msg strong {
font-family: "Trebuchet MS";
display: block;
font-size: 14px;
padding-bottom: 5px;
}

a#float_msg {
line-height: 16px;
text-align: left;
color: #fff;
text-shadow: rgba(0,0,0,0.3) 0px -1px 0px;
font-size: 11px;
font-family: Tahoma;
}

SI ME FALTA ALGO POR ALGO SERA NO? xDDD