function chkfrm(){
	if(!check_membership_radio()){  // Membership radio buttons checked: no button selected
		alert('You must select one of the membership levels in the form before you can continue.');
		return false;
	}
	
	return true;
}

function check_membership_radio(){
	if(!document.membership.amount[0].checked && 
	   !document.membership.amount[1].checked && 
	   !document.membership.amount[2].checked && 
	   !document.membership.amount[3].checked && 
	   !document.membership.amount[4].checked && 
	   !document.membership.amount[5].checked && 
	   !document.membership.amount[6].checked){
		return false;
	}
	else{
		return true;
	}
}

function update_membership_level(mlStr){
	if(mlStr != ""){
		document.membership.item_name.value = "Membership Level:  " + mlStr;
	}
	return;
}