function cuentaAtras(fechaInicio,fechaFin,objeto)
{
fechaInicio = new Date();
//fechaFin = new Date("Dec 31 2011 23:59:59");
fechaFin = new Date(fechaFin);
days = (fechaFin - fechaInicio) / 1000 / 60 / 60 / 24;
daysRound = Math.floor(days);
hours = (fechaFin - fechaInicio) / 1000 / 60 / 60 - (24 * daysRound);
hoursRound = Math.floor(hours);
minutes = (fechaFin - fechaInicio) / 1000 /60 - (24 * 60 * daysRound) - (60 * hoursRound);
minutesRound = Math.floor(minutes);
seconds = (fechaFin - fechaInicio) / 1000 - (24 * 60 * 60 * daysRound) - (60 * 60 * hoursRound) - (60 * minutesRound);
secondsRound = Math.round(seconds);
sec = (secondsRound == 1) ? " segundo" : " segundos";
min = (minutesRound == 1) ? " minuto" : " minutos, ";
hr = (hoursRound == 1) ? " hora" : " horas, ";
dy = (daysRound == 1)  ? " día" : " días, "

sec = "s";
min = "m:";
hr = "h:";
dy = "d - ";
//alert(document.getElementById('counter'));
document.getElementById(objeto).innerHTML = daysRound  + dy + hoursRound + hr + minutesRound + min + secondsRound + sec;
//return("Faltan " + daysRound  + dy + hoursRound + hr + minutesRound + min + secondsRound + sec + " <br />para el 2012!!!");
//alert("cuentaAtras('"+fechaInicio+"','"+fechaFin+"','"+objeto+"');");
newtime = window.setTimeout("cuentaAtras('"+fechaInicio+"','"+fechaFin+"','"+objeto+"');", 1000);
//alert(objeto);
}