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[lat9]

So first question is the $_POST['id[13][21]'] correct based on the array?

delia, I think that it should be

$_POST['id'][13] == 21

The $_POST['id'] array is a single dimension array. I'm not sure exactly what you're trying to do but the code above is what you'd use in an if statement to see if option_id #13 was selected as option_value_id of 21.