Is there any way to batch reset all image hitcounters? If not from admin panel, a mysql query would still be nice. The trouble is that I don't know how to write it well and I'm afraid of breaking something.

Thanks!

How about the "reset all hitcounters" button on the admin overview page?

I'm so sorry, I've searched all the pages except that one. I promise I won't post this kind of quesitons again.

Well, there are "buttons" for individual albums on the albums tab and icons on the album list as well.