Difficulty adding new address

Hi, everyone.  Hopefully this is a simple fix that I'm just not seeing.

I am trying to set up a client script on customers such that when you create a new customer and select a parent, the parent's default billing address is automatically copied to this new customer.  Here's my code:

 var parent = nlapiLoadRecord("customer", nlapiGetFieldValue("parent") );  for( var i = 1, lineCount = parent.getLineItemCount("addressbook") ; i <= lineCount ; i++ ) {   if( parent.getLineItemValue("addressbook", "defaultbilling", i) == "T" ) {    nlapiSelectNewLineItem("addressbook");    nlapiSetCurrentLineItemValue("addressbook", "defaultbilling", "T");    nlapiSetCurrentLineItemValue("addressbook", "attention",  parent.getLineItemValue("addressbook", "attention", i));    nlapiSetCurrentLineItemValue("addressbook", "addressee",  parent.getLineItemValue("addressbook", "addressee", i));    nlapiSetCurrentLineItemValue("addressbook", "phone",   parent.getLineItemValue("addressbook", "phone", i));    nlapiSetCurrentLineItemValue("addressbook", "zip",   parent.getLineItemValue("addressbook", "zip", i));    try { nlapiSetCurrentLineItemValue("addressbook", "addr1",  parent.getLineItemValue("addressbook", "addr1", i)); } catch (e) {};    nlapiSetCurrentLineItemValue("addressbook", "addr2",   parent.getLineItemValue("addressbook", "addr2", i));    nlapiSetCurrentLineItemValue("addressbook", "city",   parent.getLineItemValue("addressbook", "city", i));    nlapiSetCurrentLineItemValue("addressbook", "state",   parent.getLineItemValue("addressbook", "state", i));    nlapiSetCurrentLineItemValue("addressbook", "country",   parent.getLineItemValue("addressbook", "country", i));    nlapiCommitLineItem("addressbook");   }  }