Flash CS3: How do I specify the size of a MovieClip's contents?

Hello,

I’m very inexperienced at ActionScript so any help is appreciated. I have an MovieClip that loads a slideshow (imagerotator to be exact). I’m using AS2 loadMovie to achieve this. The images in the slideshow appear way oversized, extending the width of the entire stage. How to I constrain the size of the slideshow/MovieClip contents? All the images are going to be the same pixel dimensions so it doesn’t have to be anything fancy. Thanks!