gistfile1.js

sag.setDatabase('bwah');

sag.login({
  user: 'user',
  pass: 'pass'
); //using basic auth

sag.get({
  url: '/someDoc',
  callback: function(resp, worked) {
    if(!worked) {
      if(resp._HTTP.status == 403) {
        alert('you are not logged in');
      }
      else {
        alert('Some error!');
      }
    }
    else {
      //stuff
    }
  }
});

//////////////////////////

sag.setDatabase('bwah');

sag.login({
  user: 'user',
  pass: 'pass',
  type: sag.AUTH_COOKIE,
  callback: function(resp, succ) {
    if(!succ) {
      alert('invalid login');
    }
    else {
      alert('time to do work!');
    }
  }
});