可以列出使用JavaScript加载到网页上的外部资源吗？

I'd like to have an interval that keeps track of what items are being loaded on the current page. For example, let's say I have a page that loads a css file, a few scripts, pictures, a flash video player, and then the flash video player loads a video file. The elements loaded may or may not be from the same domain as the page. Some of them may be loaded through ajax or flash and not have a tag on the page. I want to keep track of each and make an array that stores information about them. I'd like to have an interval that keeps track o