import flash.net.FileReference;
var allTypes:Array = new Array();
var imageTypes:Object = new Object();
imageTypes.description = "Images (*.jpg, *.jpeg, *.gif, *.png)";
imageTypes.extension = "*.jpg; *.jpeg; *.gif; *.png";
allTypes.push(imageTypes);
var listener:Object = new Object();
listener.onSelect = function(file:FileReference):Void {
trace("onSelect: " + file.name);}
var fileRef:FileReference = new FileReference();
fileRef.addListener(listener);
fileRef.browse(allTypes);