293120
ok as i mention all the data are still in the database..
i just solve it by using cvs version of main.php ( modules\system\admin\images\main.php ) at first it still not showing the category, but after some day i test it again by adding new category,this time it can keep the category i just added.
so my suggest is
1. dl the cvs main.php
2. del the category you create by myphpadmin
3. add again the new category