function validateMembershipForm(){
	var objForm = document.membershipForm;
	var membership = validateButton(objForm.level);
	var volunteer = validateButton(objForm.volunteer);
	var payment = validateButton(objForm.payment);
	if(membership == null){
		alert("Please select a membership level.");
		return false;
	} else if(objForm.name.value == ""){
		alert("Please enter your name.");
		return false;
	} else if(objForm.address.value == ""){
		alert("Please enter your address.");
		return false;
	} else if(objForm.city.value == ""){
		alert("Please enter your city.");
		return false;
	} else if(objForm.zip.value == ""){
		alert("Please enter your zip code.");
		return false;
	} else if(objForm.zip.value.length < 5){
		alert("Please enter a valid zip code.");
		return false;
	} else if(objForm.phone.value == ""){
		alert("Please enter your phone number.");
		return false;
	} else if(objForm.phone.value.length < 10){
		alert("Please include the area code in your phone number.");
		return false;
	} else if(objForm.email.value == ""){
		alert("Please enter your e-mail address.");
		return false;
	} else if((objForm.email.value.indexOf("@") == -1) || (objForm.email.value.indexOf(".") == -1) || (objForm.email.value.length < 5)){
		alert("Please enter a valid e-mail address.");
		return false;
	} else if(volunteer == null){
		alert("Please choose whether or not you want to volunteer.");
		return false;
	} else if(payment == null){
		alert("Please choose a payment option.");
		return false;
	} else {
		return true;
	}
}
function validateButton(btn) {
	var cnt = -1;
	for(var i = btn.length-1; i > -1; i--){
		if(btn[i].checked){
			cnt = i; i = -1;
		}
	}
	if(cnt > -1){
		return btn[cnt].value;
	} else {
		return null;
	}
}