AS3: Loading jpgs

I’m trying to make a program to load multiple images. So far, I have

import flash.display.*;
import flash.filesystem.File;

var loader = new Loader();
loader.load("images/powell.jpg");
addChild(loader);

but when I run it, I get an error saying

TypeError: Error #1034: Type Coercion failed: cannot convert "images/powell.jpg" to flash.net.URLRequest.
    at loadImage_fla::MainTimeline/frame1()

As far as I can tell, it’s convinced that I’m trying to use the load() method from the scrollpane class (that’s where the context help takes me). How do I specify that I want to use the loader class method?

TIA