Size of a photo

i sort of asked this before but never got a clear responce to it. this is sort of a two part question. one i have a dynamic gallery of images with a small picture that you click on that loads a bigger picture. I would love to be able to just have one photo that loads into the bigger mc and also the small mc. right now what i am doing is making two size photos a small 47x47 and a large141x141.

does anyone know how i can use the same photo for both mc’s

second question. if that works will it make the small photos take forever to load since their sorce is a large photo?

thanks a ton

rL