Pricing script won't do it's thing

Hello

I've written a script to auto-populate 4 different price levels based on a figure entered into a custom field. It triggers on field changed. It triggers correctly. The values populate themselves and all is good... until you save the record. It won't save the new pricing values. In fact, it won't save any values entered into the pricing fields manually either.

Anyone care to comment?

 function field_change(type,name)    {      var baseprice = (nlapiGetFieldValue('custitemsellpricegst') / 1.1);   var corpten = ((nlapiGetFieldValue('custitemsellpricegst') - 0.833333) / 1.1);   var corpfive = ((nlapiGetFieldValue('custitemsellpricegst') - 0.416667) / 1.1);   var bprice = Math.round(baseprice*10000)/10000;   var tenprice = Math.round(corpten*10000)/10000;   var fiveprice = Math.round(corpfive*10000)/10000;      if (name == 'custitemsellpricegst')      {        document.getElementById("price_price_1_1_fs").value = bprice;    document.getElementById("price_price_1_2_fs").value = tenprice;    document.getElementById("price_price_1_3_fs").value = fiveprice;    document.getElementById("price_price_1_7_fs").value = bprice;         }    }