Looking for thumbnail preview script
 

I am looking for thumbnail preview script that can randomly pick 10, 20, 30 or whatever I want from my database and automaticlly make whatever size thumbs I define and display throughout like every hour, 2 hour, 12 hour, 24 hour or whatever I want?
So once I have enough galleries in my database I don't have to touch my site for a long while.
I've checked alot of scripts but not the one I'm looking for.
I need some help here people.