if you just want to edit some fields you can use nlapiSubmitField

var fields = new Array();
var values = new Array();
fields[0]='phone';
values[0] = "<tel:800-555-1234|800-555-1234>";
fields[1] = 'url';
values[1] = "<http://www.goodtimeswithsuitescript.com|www.goodtimeswithsuitescript.com>";
fields[2] = 'billpay';
values[2] = "T";
var updatefields = nlapiSubmitField('customer', '149', fields, values);