oh yeah, the split and tootone effects are done in layers
for those who dont know how to get the layers, read this
TO ADD A NEW LAYER u just open the picture u want to put in (without closing the one ur working on), and in the LAYERS window u click and drag it onto the canvas ur using. ittl appear on it.
to resize and move it go edit>transform>scale and ull get the dots around it, so u can resize and move it. when urve got it, hit enter
to merge two layers together, get ur first picture up, then insert a new layer with the above procedure. then click on the mask button in the layers window, and make sur the mask (the whte square next to ur image in layers window).
to see ur other layer underneath it, get ur paintbrush, and have black up top (not in backround) then paint over it and ur first layer will appear underneath it
so....yeah hope ive helped someone