I want to create animated wallpapers,does anybody know how??

i mean i know already that there is an option in photoshop cs2 and adobe imageready for animation, but the problem is that i dont know how to work with it. i dont know how to make many files open in one window in photoshop, but i realy want to create animation myself, im so fond of it, please give me answers in details so that i can get you guys, and if there s any software plz name it, i wil buy it as i dont want tutorilas which will last only for some limited period of time. please please give me detailed answers.