[totaltec]

Look in include/login.php I would pass a variable in the URL, from your login link. Like login.php?cat_return=1.

Then test for this in the PHP file, and if found assign a variable to smarty.

Then include a hidden input field in the login form, and populate it with 0 or 1 depending on whether this return value is set.

Then on form submission and successful login, assign the $redirect_url to your special origin point if that hidden input field is populated.