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Bunny.html
In the bunny web page example, both bunny.html and bunny.gif are located in the same directory. (http://www.stanford.edu/group/csp/cs03/demos/)
That's why we could use relative URL to insert the graphic (<img src="bunny.gif" />).
If we wanted to use the fully-qualified URL, it would have been:
<img src="http://www.stanford.edu/group/csp/cs03/demos/bunny.gif" />
But since both bunny.gif and bunny.html are on the same server (not to mention in the same folder), it makes better sense to use the relative URL.