Open a spreadsheet in Excel, e.g. 'Microsoft Office uses' table done the first week
Delete any unwanted columns or rows:
Select the part of the spreadsheet you would like to be exported
Export the table as HTML:
The dialog will change...
You can then choose to Save (and the document will take its name) or Publish.
Publish will leave the original document as an Excel file.
Open the web page in Dreamweaver
From the top menu bar select Commands > Clean up Word HTML
It will complain a little, but force it to convert the document anyway from the version of Office that you have. Excel exports in a very similar manner to Word, and, with a little persuasion, Dreamweaver can halve the length of the code, speeding up download times.
Re-save your document.