mu-plugins s2-hacks.php not working?

I am trying to disable download confirmation and have read several posts on how to do so. However, after following all the steps it is still showing the pop up box. It seems it is not recognizing my hacks and I can’t figure out why. I created the mu-plugins file and s2-hacks.php file and inserted the following code. Is there something I am missing? HELP!

<?php
add_action("wp_head", "s2_skip_confirmation"); function s2_skip_confirmation()
	{
		echo '';
		echo 'var ws_plugin__s2member_skip_all_file_confirmations = true;';
		echo '';
	}
?>

thank you very much!!!