function getDay(year,month,dayObject){
	var year=parseInt(year);
	var month=parseInt(month);

	switch (month){
		case 4:
		case 6:
		case 9:
		case 11:
		var day=30;
		break;
		case 2:
		if (year%4==0){
			if (year%100==0){
				var day=year%400==0?29:28;
			}else{
				var day=29;
			}
		}else{
			var day=28;
		}

		break;
		default:
		var day=31;
	}

	dayObject.length=0;

	for(var i=1;i<=day;i++){
		dayObject.options[i-1]=new Option(i,i);
	}
}