The notices are stemming from your array, you need to put single quotes around the associative key. i.e.:
$_GET['loginfo']
You should do this with all your POST, GET, and associative array values. Everything else looks fine to me. The notices are appearing because of the error reporting we turned on. Change that and tell me if the pages still turn up blank, like I said before, that usually means there's a syntax error somewhere. Do you get any other errors?
(If that's not line 61 in mylogin.php, we need to see that and some surrounding code, before and after line 61.)