Ajax loading from mysql ?

Hi.

I've checked the loaditem handler that reads from a txt file.
I want to connect jcarrousel with my myqsl database, the problem is, i don't want to load 10 or 30 images at a time. This is to make a slideshow, and i have users with more than > 200 photos in our webportal. The thing is, i know php and mysql enought but my javascript kind of sucks.

Can you think in a way to read for example 20 images of a time, and then if he goes to the end of this 20 photos the script adds more 20 to the carrousel and so on until it stop returning new data ?

Thanks.