imageready rollovers

ok here is what thesource showed. I want only 2 images of each rollover, but i am getting 3, and a mixture of the same names of the image along with the coresponding image name as well. I want normal and over.. but why am I geting this??

jrotcbt_over = newImage("images/jrotcbt_over.gif");
jrotcbt_ocsbt_over = newImage("images/jrotcbt_ocsbt_over.gif");

I want the image and the normal and over state, so why is it including jrotcbutton_ocsButton together?? it all works well but i dont want that extra image with the 2 names together. How in the world did i do this>? "So confused" I want jrotcimage than normal and over ocs the same way so why am i getting that code??