if (isJsEnabled()) {
  addLoadEvent(addressCopy);
}

function addressCopy(){
  var keys = ['firstname','lastname','street1','street2','city','state','zip'];
  for(var i=0; i<keys.length; i++){
    $('edit-address-billing-'+keys[i]).onblur = updateShipping;
  }
}

function updateShipping(){
  var shipping = $(this.id.replace('billing','shipping'));
  if(shipping.nodeName == 'SELECT' && shipping.selectedIndex == 0){
    shipping.selectedIndex = this.selectedIndex;
  }else if(shipping.nodeName == 'INPUT' && !shipping.value ){
    shipping.value = this.value;
  }
  return false; 
}