function URLupdate(){
var queryString = Math.random();

  var cellFunction1 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A3').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B3').setValue(cellFunction1);
  var cellFunction2 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A4').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B4').setValue(cellFunction2);
  var cellFunction3 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A5').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B5').setValue(cellFunction3);
  var cellFunction4 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A6').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B6').setValue(cellFunction4);
  var cellFunction5 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A7').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B7').setValue(cellFunction5);
  var cellFunction6 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A8').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B8').setValue(cellFunction6);
  var cellFunction7 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A9').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B9').setValue(cellFunction7);
  var cellFunction8 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A10').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B10').setValue(cellFunction8);
  var cellFunction9 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A11').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B11').setValue(cellFunction9);
  var cellFunction10 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A12').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B12').setValue(cellFunction10);
  var cellFunction11 = '=IMPORTXML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A13').getValue() + '?' + queryString + '","'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!A1').getValue()  + '")'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!B13').setValue(cellFunction11);
  var cellFunction12 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A3').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!A16').setValue(cellFunction12);
  var cellFunction13 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A4').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!F16').setValue(cellFunction13);
  var cellFunction14 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A5').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!K16').setValue(cellFunction14);
  var cellFunction15 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A6').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!P16').setValue(cellFunction15);
  var cellFunction16 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A7').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!U16').setValue(cellFunction16);
  var cellFunction17 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A8').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!A50').setValue(cellFunction17);
  var cellFunction18 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A9').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!F50').setValue(cellFunction18);
  var cellFunction19 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A10').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!K50').setValue(cellFunction19);
  var cellFunction20 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A11').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!P50').setValue(cellFunction20);
  var cellFunction21 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A12').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!U50').setValue(cellFunction21);
  var cellFunction22 = '=IMPORTHTML("' + SpreadsheetApp.getActiveSheet().getRange('TravelStock!A13').getValue() + '?' + queryString + '",'+ SpreadsheetApp.getActiveSheet().getRange('TravelStock!B1').getValue()  + ')'; SpreadsheetApp.getActiveSheet().getRange('TravelStock!A81').setValue(cellFunction22);
}
function onOpen() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet();
  var entries = [{
    name : "Refresh Stock",
    functionName : "URLupdate"
  }];
  sheet.addMenu("Script Center Menu", entries);
};