function verifypurchase() {

if (document.purchase.registration_firstname.value == "") {
  alert('Please fill in your first name.')
  document.purchase.registration_firstname.focus() 
  return false } 

if (document.purchase.registration_lastname.value == "") {
  alert('Please fill in your last name.')
  document.purchase.registration_lastname.focus() 
  return false } 
  
if (document.purchase.registration_address1.value == "") {
alert('Please fill in an address.')
document.purchase.registration_address1.focus() 
return false } 
  
if (document.purchase.registration_city.value == "") {
  alert('Please fill in a city.')
  document.purchase.registration_city.focus() 
  return false } 

var countryName = document.purchase.registration_country;
if(countryName.options[countryName.selectedIndex].value =="") {
  alert("Please select a country.")
  document.purchase.registration_country.focus() 
  return false }
    
if (document.purchase.registration_phone.value == "") {
  alert('Please fill in a phone.')
  document.purchase.registration_phone.focus() 
  return false } 

if (document.purchase.registration_email.value == "")  {
   alert('Please fill in your email address.')
   document.purchase.registration_email.focus() 
   return false }
else {
if (!check_email(document.purchase.registration_email.value)) {
    alert('Email address is incorrect. Please enter your email again.')
    document.purchase.registration_email.focus()
    return false } 
 }
}