// JavaScript Document
//<!--
function calcAge(birthDate, birthMonth, birthYear){	
	theDate = parseInt(birthDate,10);
	theMonth = parseInt(birthMonth,10);
	theYear = parseInt(birthYear,10);

	if (isNaN(theDate) || !(theDate >= 1 && theDate <= 31)) return 'badDate';
	if (theYear.toString().length != 4 || (birthYear.length!=4))  return 'badYear';
	if (isNaN(theMonth)) return 'badMonth';
	//if (isNaN(theYear) || (birthYear.length!=4))  return 'badYear';

	curDate = new Date();
	yearsOld = curDate.getFullYear() - theYear;
	monthsOld = (curDate.getMonth() + 1) - theMonth;
	daysOld = curDate.getDate() - theDate;

	if ((monthsOld < 0) || (monthsOld == 0 && daysOld < 0)) yearsOld --;
	if (yearsOld < 0) yearsOld = 'badYear';
	return yearsOld;
}


function validateAge(){
	ageForm = document.forms.theForm;

	birthMonth = ageForm.monthField.options[ageForm.monthField.selectedIndex].value;
	birthDate = ageForm.dateField.value;
	birthYear = ageForm.yearField.value;

	myAge = calcAge(birthDate, birthMonth, birthYear);

	if (myAge >=19){
		document.location.href="pages/main_index.htm"
		}else{
			if (myAge < 19 && myAge > 0){
			alert("Sorry, you must be legal drinking age to enter.");
			return;
			}

			if (myAge == 'badDate'){
			ageForm.dateField.focus();
			alert("Please enter a valid date");
			ageForm.dateField.value=''
			}
			if (myAge == 'badYear'){
			ageForm.yearField.focus();
			alert("Please enter a valid year");
			ageForm.yearField.value=''
			}
			if (myAge == 'badMonth'){
			ageForm.monthField.focus();
			alert("Please enter a valid month");
			ageForm.monthField.value=''
			}

		}		

}

//-->