Well without seeing the code it's hard to answer the question.
What yo uare doing is passing two variables to your index.php page, so typically it should return you to that page with those variables used one way or another. In your index.php page you could have something like:
echo("bka: " . $_GET['bka'] . " id: " . $_GET['id']) ;
and that will show you the variables.
What exactly are you trying to do?