function beforeLoad(type, form) {
  // NS passes type as an Object, not a String!
  if (type.toString() === 'view') {
    var record = nlapiGetNewRecord();
    var url = nlapiResolveURL('SUITELET', 'customscript_mos_od_dispatch_sl', 'customdeploy_mos_od_dispatch_sl');
    var id = record.getFieldValue('tranid');
    var script = "window.location='" + url + "&current_step=select_order&salesorder=" + id + "';";
    form.addButton('custpage_mos_od_dispatchorder', 'Dispatch Order', script);
  }
 }