[joestern]

Ok--I got it. Here is the copybilling.js for 3.x...or at least this is what worked for me:

function InitSaveVariables_shipping(form){ 
s_firstname = form.s_firstname.value; 
s_lastname = form.s_lastname.value;
s_company = form.s_company.value;   
s_address = form.s_address.value; 
s_address2 = form.s_address2.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.s_firstname.value = form.b_firstname.value; 
form.s_lastname.value = form.b_lastname.value; 
form.s_company.value = form.b_company.value; 
form.s_address.value = form.b_address.value; 
form.s_address2.value = form.b_address2.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.s_firstname.value = ""; 
   form.s_lastname.value = ""; 
   form.s_company.value = ""; 
   form.s_address.value = ""; 
   form.s_address2.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 = ""; 
 <!--   document.getElementById('_s_state').value = ""; 
   } 
}