The page to set up alerts for a SharePoint list requires the list ID to be passed in as a query string. The follow code will get the ID for the list with a specific title. It will then open the alerts setup page for that list in a SharePoint dialog box.
1: var context = new SP.ClientContext.get_current();
2: var listTitle = 'TitleOfYourList';
3: var list = context.get_web().get_lists().getByTitle(listTitle);
4: context.load(list);
5:
6: context.executeQueryAsync(function (sender, args) {
7: var id = list.get_id();
8: NewItem2(e, 'http://yoursite/\_layouts/SubNew.aspx?List=' +id);
9: });