Okay I have been able to fix this issue, but now I have another question.
Is there something particular I need to keep in mind when embedding images in an ePub file?
If I have an image embedded in my HTML file <img src="testimage.jpg" /> I will get the following error message when I run the file through epubcheck.
ERROR: jdghvol5.epub/DrPrometheus WIN_split_000.html(8): required attributes missing
Am I missing something?