function List1() {

  var selection = SpreadsheetApp.getActiveSheet().getActiveCell().getValue();

    var html = "<script>window.open('XXXXXXXX');google.script.host.close();</script>";
    var userInterface = HtmlService.createHtmlOutput(html);
    SpreadsheetApp.getUi().showModalDialog(userInterface, 'abrakadabra');

}
function List2() {

  var selection = SpreadsheetApp.getActiveSheet().getActiveCell().getValue();

    var html = "<script>window.open('https://docs.google.com/spreadsheets/d/1uTduz69rYOB7ea5meG6Y/edit#gid=80681251&range=A1');google.script.host.close();</script>";
    var userInterface = HtmlService.createHtmlOutput(html);
    SpreadsheetApp.getUi().showModalDialog(userInterface, 'Čekejte prosím');

}