Select item line location based on user

I am trying to use the client side pageInit event to autoset the Location field for all items on an Item Fulfillment based on the logged in user.  So wrapped in a conditional for the correct user I have:

     for (var i = 1; i <= nlapiGetLineItemCount('item'); i++) {      alert('Current Location: '+nlapiGetLineItemValue('item', 'location', i));      nlapiSetLineItemValue('item', 'location', i, 1);      alert('Current Location: '+nlapiGetLineItemValue(item', 'location', i));       } 

The alerts show me the empty field in both cases - so the attempt to set the location is not working - but it is also not throwing an error.  Any one have experience with this or any suggestions?  Thanks.