[CSS-HTML]Burbuja de dialogo

<style type="text/css">

.commentbox{
background-color: #ececec;
width: 450px;
padding: 10px;
}

.commentfooter{
background: url(http://img.webme.com/pic/m/mundo-pgd/sintaxhtmlejemps.gif) 20px 0 no-repeat; /*20px 0 equals horizontal and vertical position of arrow. Adjust as desired (ie: 20px -5px).*/
padding-left: 58px;
padding-top: 1px;
margin-bottom: 2em;
font-size: 90%;
color: #4A4A4A;
}
</style>

<div class="commentbox">Aqui pondre mi texto.</div>
<div class="commentfooter">Sacado de Dynamicdrive</div>