hey! do you know that your name is similar to one of the GMs? lol..
anyway, here to the question:
you can't do animations right of photoshop (at least I don't know a way)
if you want to make a gif:you will have to create each frame separately and then combine them into a gif with some freeware side prog
also if you want some realy complex animations you should consider going over to flash and creating it there. in flash you have much more control over movement and such. also flash fiules can be converted to gifs too so you can use them in almost any forum and some forums have even coding support (like this one) and let you insert SWF files directly without converting them