Im not sure how to check this using PHPMyAdmin, but it should be similar:
In The MySQL GUI Tools open the MySQL Administrator. Select your Schema, then double click the productimport to bring up the table editor. On the Advanced Options Tab, The Auto Increment option lets you set the next key to be used.
For the error:
Change line 140 - 142:
}?>
<?php
to:
}?>
<?php