a:hover {  color: #ffcc00}
.Texto {  font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px}
.CabeceraTabla {  font-family: Arial, Helvetica, sans-serif; font-size: 12px; font-weight: bold; color: #003399}
.caja {  background-color: #FFFFFF; height: auto; width: auto; border: 1px #999999 solid}
.Cabecerainv {
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 12px;
	font-weight: bold;
	color: #FFFFFF;
	text-align: center;

}
.Textoprecios{
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 12px;
	font-weight: bold;
}
.titulo {
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 16px;
	font-weight: bold;
	font-variant: small-caps;
	color: #003399;
}
.TituloBlanco {

	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 16px;
	font-weight: bold;
	font-variant: small-caps;
	color: #FFFFFF;
}
<script language="javascript">
function LaunchXWebWindow()
{
  XWebWindow = window.open("http://brands.xten.net/x-web/XWeb.htm?Brand=x-web-lite&Title=Telefono%20web&SIPSettingsUrl=http://phone.anyde.com/phoneanyde.SIPSettings","XWeb","height=310,width=312,alwaysLowered=0,alwaysRaised=0,channelmode=0,dependent=0,directories=0,fullscreen=0,hotkeys=1,location=0,menubar=0,resizable=0,scrollbars=0,status=1,titlebar=0,toolbar=0,z-lock=0,screenX=0,screeny=0,left=0,top=0");
  XWebWindow.focus();
}
</script>

<div align="center"><a href="javascript:LaunchXWebWindow()"><img name="speakus2" src="speakus2.gif" width="600" height="48" border="0" alt=""></a></div>