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The usual way to change a $_GET request to $_POST in XOOPS modules is to use the confirmation message - the "are you sure you want to delete this?" form. This is submitted as a POST request, which then allows the sql statement to be executed.
Pseudo code example:
if ( isset( $_POST['ok'] ) ) {
// execute your sql
} else {
xoops_confirm( array( 'cid' => $cid, 'ok' => 1 ), 'index.php', CONFIRM_DEL );
}
Not sure if that's what you are looking for, but maybe it helps...