Use the post method to submit your forms, not the get method. So, instead of
<form name="blah" action="foo.php" method="get">
use
<form name="blah" action="foo.php" method="post">
You'll need to use $POST or $HTTP_POST_VARS instead of $GET or $HTTP_GET_VARS, but it will show only "foo.php" in the URI-string.