how find source of image pasted into Word document?

(1) How can I determine the source of objects pasted into Word documents?

(2) If this is not possible, is there a way to retain source information when pasting an image into Word, without linking or embedding the file (i.e. I dont want the image to make the file too big, and I often move around files so links break)

I am using WinXP and Office 2003 was just replaced with Office 2007.

Thanks in advance.