URL parsing to get variables name

[trashed]

hi.
maybe the solution to my problem is quite obvious but I can't find it, so I'm asking here.I'm building a small movie db with the chance for users to borrow the title they want.
the movies' info is fetched from a db and displayed in a html table.
this table has a column containing a checkbox named as the numeric ID of the movie:

<input name="'.$id.'" type="checkbox">

now, I want to create a confirmation page before the user sends in the form with what he/she wants to borrow, but I can't figure out how to parse the URL.
when I submit the form with GET method, I get something like this:order_preview.php?name=Andrea&205=on&206=on&Submit=Send
I can see that the numbers represent the checkboxes selected but how do I parse the URL to get those numbers and not the "on" value?

thanks

Andrea

[stymiee]

foreach ($_GET as $key => value)
{
    echo $key . "<br />";
}

[trashed]

thanks.
i'll see if it can solve my troubles :D