function overEighteen(age)
{
var eighteenDate = new Date();
var eighteenYear = eighteenDate.getFullYear()-18;
eighteenDate.setFullYear(eighteenYear);

if (age < eighteenDate) {return true;}
else {return false;}
};

function checkDate()
{
	var age = new Date();
		
	age.setMonth(document.game_sweeps.month[document.game_sweeps.month.selectedIndex].value-1);
	age.setDate(document.game_sweeps.day[document.game_sweeps.day.selectedIndex].value);
	age.setYear(document.game_sweeps.year[document.game_sweeps.year.selectedIndex].value);
	
	if (overEighteen(age)) {
		return true;
	} else {
		alert("Sorry, this contest isn't open to your age group.")
	 	return false;
	}
}

function sendEntry(){
	if(document.game_sweeps.optin_one.checked){
		document.game_sweeps.optin.value = "1";
	}
	document.game_sweeps.submit();
}

function validateEntry(){
	if(document.game_sweeps.first_name.value=="" || document.game_sweeps.last_name.value=="" || document.game_sweeps.email.value==""  || document.game_sweeps.day.value=="" || document.game_sweeps.month.value=="" || document.game_sweeps.year.value==""){
		alert("All fields are required");
		return false;
	}
	if(checkDate()){
		sendEntry();
	}
}