Preloader - i know

i know that this is probably one of the most comon problems but im trying to make a preloader.

what i want to do is have a image loaded using the loadmovie function. the image is a jpg - not a swf. i want there to be a preloader for the image. many different images can be loaded into the image holder but i want there to be only one preloader for the image.

how would i do this?

thanks a lot