Loading multiple files

hey!! I have a bit of a problem. In a website i have 10 buttons and each of them loads an image. the image only loads into a empty movie clip as soon as i press the button.
What i want to try is to start load the images as soon as i enter that page, and I want the buttons to show, only when their image is loaded. Kinda like a progressive thing.
What i have to do?? send each image to a different level when loading?

please somebody help me!!

is there any tutorial about this??

thanks