[mattw]

so this is what i ended up with in copybilling.js

function InitSaveVariables_shipping(form){ 
additional_values_5 = form.additional_values_5.value; 
additional_values_6 = form.additional_values_6.value; 
s_address = form.s_address.value; 
s_address_2 = form.s_address_2.value; 
s_city = form.s_city.value; 
s_state = form.s_state.value; 
_s_state = document.getElementById('_s_state').value; 
s_country = form.s_country.value; 
s_zipcode = form.s_zipcode.value; 
} 

function copybilling(form){ 
if (form.copyb.checked){ 
InitSaveVariables_shipping(form); 
form.additional_values_5.value = form.additional_values_2.value; 
form.additional_values_6.value = form.additional_values_3.value; 
form.s_address.value = form.b_address.value; 
form.s_address_2.value = form.b_address_2.value; 
form.s_city.value = form.b_city.value; 
form.s_country.value = form.b_country.value; 
form.s_zipcode.value = form.b_zipcode.value; 
change_states(document.getElementById('s_country'), 's_state', 'State/Province', '', '', '', ''); 
form.s_state.value = form.b_state.value; 
document.getElementById('_s_state').value = document.getElementById('_b_state').value; 
} 

else { 
   form.additional_values_5.value = ""; 
   form.additional_values_6.value = ""; 
   form.s_address.value = ""; 
   form.s_address_2.value = ""; 
   form.s_city.value = ""; 
   form.s_country.value = form.b_country.value; 
   form.s_zipcode.value = ""; 
   change_states(document.getElementById('s_country'), 's_state', 'State/Province', '', '', '', ''); 
   form.s_state.value = form.b_state.value; 
   document.getElementById('_s_state').value = ""; 
   } 
}