// JavaScript Document
function FillBilling(f) {
  if(f.billingtoo.checked == true) {
    f.shipaddress.value = f.billaddress.value;
    f.shipcity.value = f.billcity.value;
    f.shipstate.value = f.billstate.value;
    f.shipzip.value = f.billzip.value;
    /* If more fields are used, just expand the parameters
       above to include the additional fields. */
  }
}