var ProgressClip;
var LoadingText;
var PROGRESS_CLIP_WIDTH = 330;
var PROGRESS_CLIP_HEIGHT = 11;

function Loaded(sender) {
    ProgressClip = sender.findName("ProgressClip");
    LoadingText = sender.findName("LoadingText");
}

function onSourceDownloadProgressChanged(sender, eventArgs) {
    ProgressClip.Rect = "0, 0, " + eventArgs.progress * PROGRESS_CLIP_WIDTH + ", " + PROGRESS_CLIP_HEIGHT;
    LoadingText.Text = Math.round((eventArgs.progress * 1000)) / 10 + "%";
}