Form problem variables are being sent in the query string

I have 2 form fields one is a checkbox and the other is a hidden field. The checkbox is called "Display_" and gets incremented as the table rows are built like so. 'Display_'.$rec_count + 1 The hidden field is an array like this: Field[] The form method is $_SERVER['PHP_SELF'] For some reason, these form variables are being passed on the query line. Is there any way this can be prevented? Thanks in advance, Jim