You can add a form that will authenticate users with activeCollab directly from your website. To do this, you need to add a form with specific fields that submits a POST request to activeCollab's login page.

Required fields for this are:

  1. login[email]
  2. login[password]
  3. login[remember]

Additionally you need to include a "submitted" hidden field with a "submitted" value for activeCollab to accept the submitted data.

Here is the example form markup:

<form method="post" action="http://www.activecollab.com/my/ac/public/index.php?path_info=login">
  Email: <input type="text" name="login[email]" />
  Password: <input type="password" name="login[password]" />
  Remember me: <input type="checkbox" name="login[remember]" />
  <input type="hidden" name="submitted" value="submitted" />
  <button type="submit">Go baby go!</button>
</form>

Feel free to change it to fit your needs, but please make sure that the names of the fields are not changed and that the form action points to the login form of your activeCollab. installation.