Excel (as many MS programs) have a "Save As HTML" option. When I opened my copy of Excel up, it didn't have that option, so I when to the Help Index and typed in "html" and found this:
Create a Web page from worksheet data or a chart
If the Save As HTMLcommand doesn't appear on the File menu in Microsoft Excel, you need to install the Internet Assistant add-in program. For more information, click .
1 Click a cell in the data that you want to convert to a Web page.
2 On the File menu, click Save As HTML.
3 Follow the instructions in the Internet Assistant.
So, that would be one option. Just use Excel's "save as Html". You probably won't want to do much modification of the resulting file tho. I've exported Word files as HTML and they are full of a lot of detailed HTML. I've found that they aren't worth my time to try to edit.