Simple gallery auto transition with external images


I’m looking for a very simple tutorial or code that would function as follows:

A series of images need to be loaded externally and transitioned automatically with a “fade” effect. I have probably around 80 of these small images (about 2kb each) right now, but want to be able to add to these as time goes by. There is not need for thumbnails or anything like that. Just an auto playing sequence for a part of a web page. There should probably be a preloader also.