function christmas() {
	var d = new Date();
	//var d = new Date(10,12,20)
	var day = d.getUTCDate();
	var month = d.getMonth();

	if ((month == 11 && day > 21) || (month == 0 && day < 6)) {
		// make visible
		document.getElementById("christmas").style.visibility = 'visible';
		document.getElementById("christmas2").style.visibility = 'visible';
	}
}