function populate_billing_details() {
  document.forms['edit'].billing_address_street.value = document.forms['edit'].home_address_street.value;
  document.forms['edit'].billing_address_suburb.value = document.forms['edit'].home_address_suburb.value;
  document.forms['edit'].billing_address_city.value = document.forms['edit'].home_address_city.value;
  document.forms['edit'].billing_address_post_code.value = document.forms['edit'].home_address_post_code.value;
  document.forms['edit'].billing_address_state.value = document.forms['edit'].home_address_state.value;
  document.forms['edit'].billing_address_country.value = document.forms['edit'].home_address_country.value;
}

function populate_billing_details_new() {
  document.forms['edit'].billing_address_street.value = document.forms['edit'].home_address_street.value;
  document.forms['edit'].billing_address_suburb.value = document.forms['edit'].home_address_suburb.value;
  document.forms['edit'].billing_address_post_code.value = document.forms['edit'].home_address_post_code.value;
  document.forms['edit'].billing_address_state.value = document.forms['edit'].home_address_state.value;
}